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Logic: Critical Thinking and Correct Reasoning

The document discusses logic and critical thinking. It defines logic as the study of fundamental principles that govern correct reasoning. Logic has two parts - formal logic deals with rules and principles, while material logic deals with the substance of reasoning. The document also discusses different types of terms used in logic, such as simple and complex terms, abstract and concrete terms, and universal, particular and singular terms. It provides examples to illustrate logical reasoning and different types of terms.

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Prof. Sam Bernales, Jr. 02/10/17 03:00 AM 1 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Logic • Logike/ Logia/ Logos – Coined by Zeno the Stoic • Analytics – Prior and Posterior – Study – Reason – Discourse – Study of the fundamental principles which govern the true nature of correct reasoning or inferential thinking. 02/10/17 03:00 AM 2 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Logic • Science and Art of Critical Thinking and Correct Reasoning • Science – Systematized body of Logical Truths and Principles governing correct thinking • Art – Beautiful and Good reasoning – Power to perform certain actions guided by special knowledge and executed with skill 02/10/17 03:00 AM 3 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Logic in Profession • Facilitates in organizing ideas. • Scientists – Scientific Method • Public Speaker – Organization of Idea • Lawyer – Good argument to prove position • Household – Planning and organizing things in house. 02/10/17 03:00 AM 4 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Logic in Profession • Activity – How can I apply Logic in my profession? 02/10/17 03:00 AM 5 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Mind Teaser • Activity – Abstract Reasoning • Inverse the Triangle by moving only 3 balls 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 6
Mind Teaser • Activity – Abstract Reasoning • Connect all the spheres in 4 straight uninterupted lines 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 7
Activity • Abstract Reasoning 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 8
Mind Teaser • Verbal Reasoning – Question • Mayroong 64 na maleta sa eroplano na nasa himpapawid. Kung nahulog ang isa, ilan na lang ang natira? – Answer • 63 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 9
Mind Teaser • Verbal Reasoning – Question • Paano ipapasok ang elepante sa loob ng refrigerator sa tatlong paraan? – Answer • 1. Buksan ang refrigerator • 2. Ipasok ang elepante • 3. Isara ang refrigerator 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 10
Mind Teaser • Verbal Reasoning – Question • Paano ipapasok and giraffe sa loob ng refrigerator sa apat na paraan? – Answer • 1. Buksan ang refrigerator • 2. Ilabas ang elepante sa refrigerator • 3. Ipasok ang giraffe sa loob ng refrigerator • 4. Isara ang refrigerator 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 11
Mind Teaser • Verbal Reasoning – Question • Kaarawan ng haring leon. Lahat ng hayop naroon pero may nawawalang isa. Anong hayop ito? – Answer • Giraffe, naiwan sa loob ng refrigerator 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 12
Mind Teaser • Verbal Reasoning – Question • Paano makakatawid sa ilog ang isang babae nang hindi kakainin ng mga buwaya? – Answer • Tatawid lang siya kasi nasa kaarawan ng haring leon ang lahat ng hayop 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 13
Mind Teaser • Verbal Reasoning – Question • Habang tumatawid sa ilog ang babae, siya ay namatay. Ano ang dahilan ng kanyang pagkamatay? – Answer • Sa kanya bumagsak yung maleta mula sa eroplano 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 14
Mind Teaser • Verbal Reasoning – Question • How many dwarves are there in the story of Cinderella? – Answer • None. It was Snow White who has seven dwarves. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 15
Mind Teaser • Verbal Reasoning – Question • Which is heavier, 1kg of Gold or 1kg of Feather? – Answer • There is no heavier between the two. Both of them weights 1kg. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 16
Mind Teaser • Verbal Reasoning – Question • Inutusan ka para barilin ang isang target. Ang sabi sayo, kung mata tamaan mo, saka ka babayaran. Tinamaan mo sa noo ang target, pero hindi ka binayaran ng taong nag- utos sayo. Ano ang dahilan bakit di ka binayaran? – Answer • Hindi mo natamaan sa mata ang target. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 17
Mind Teaser • Verbal Reasoning – Question • May isang babae na dumalaw sa isang puntod. Noong tinanong siya kung kaanu-ano niya ang nasa puntod and sagot niya, “Ang nanay niya ang nag- iisang anak ng nanay ko.” Kaano ano nya ang nasa puntod? – Answer • Anak 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 18
Activity • Verbal Reasoning 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 19
Divisions of Logic • Formal (Form) – Rules – Principles • Simple apprehension – Grasp entity or reality • Judgment – Compares two ideas based on relation • Reasoning – Abstraction • Material (Matter) – Substance of reasoning 02/10/17 03:00 AM 20 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Exempli Gratia All senators are politicians. No senators are congressmen. X Ergo, no congressmen are politicians. Formally Correct Materially Wrong All nurses are health- care professionals. Some nurses are Filipinos. Ergo, some Filipinos are health-care professionals. Formally Correct Materially Correct 02/10/17 03:00 AM 21 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Formal Logic • Every cat is an animal • Every tiger is an animal • Ergo, every tiger is cat Formally Wrong Materially Wrong 02/10/17 03:00 AM 22 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Formal Logic • Every cat is animal • Every pig is animal • Ergo, every pig is cat. Formally Wrong Materially Wrong 02/10/17 03:00 AM 23 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Formal Logic • Every animal is four legged substance • Some table is animal • Ergo, every table is four-legged substance. Formally Correct Materially Wrong 02/10/17 03:00 AM 24 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Structure of Logic External Expressions/ Significations Mental Operations Term/ Concept Simple Apprehension Proposition Judgment Syllogism/ Fallacy/ Debate Reasoning/ Argument 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 25
Terms • Terms – Signs of concepts – Instrumental signs – Expression of an idea – Thought – Concept – Mental Proposition – Mental Argumentation 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 26
Terms according to Structure • Simple – Consist only one word • Skunk • Complex – Consists of a group of words that signify one thing • The black little cat-like animal with the white stripe down its back is a skunk 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 27
Terms according to Essence • Significant – Signifies the quiddity (whatness) or nature of the thing they stand for • Man, Dog • Non-significant – merely point out things without signifying their quiddities or nature • This, That, Those 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 28
Terms According to Components • Simple – Only one feature • Book • Compound – Several features • Human Person 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 29
Terms According to Comprehension • Concrete – Expresses something which has attributes that are capable of being perceived through the senses. • ball, can, desk, stone • Abstract – expresses something as separated from any single object. It denotes the general attributes of many objects. • When I sit next to you, my heart beats definitely faster. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 30
Terms According to Comprehension • Abstractive – Creates a meaning out of own experience • Great experience • Being whole • Happiness • Intuitive – Requires presence of an object • Hot coffee • Warmth of day 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 31
Terms According to Comprehension • Absolute/ Privative – No relation to other idea • God • Relative – Explicit relation to other idea • Teacher and Student • Master and Slave 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 32
Terms According to Comprehension • Complete – Expresses all features • Dog • Incomplete – Expresses only some features • Dog as an animal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 33
Terms according to Comprehension • Generic – Common feature • Being • Paracetamol • Specific – Distinctive feature • Rational • Biogesic 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 34
Terms according to Extension • Common – General term • Professor • Individual – One object • Proper Name – Prof. Dumbledore • Particular Circumstance – Head Professor of Hogwarts • Demonstrative Pronoun – This Professor 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 35
Terms according to Extension • Distributive – Essence of entities singularly • Fish • Ant • Collective – Essence of entities as group • School of Fishes • Colony of Ants 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 36
Terms according to Extension • Universal – represents not only a class as a whole but also each member of the class • table, chair, stone • Collective – represents a number of things constituting a unit-group or whole • family, choir, band, team • Particular – represents only a part of the universal whether it is definite or indefinite • three kings, few guests • Singular – represents a single object • My father, this book 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 37
Activity • Topic – Terms according to Extension • Instruction – Identify the term according to extension: • Universal • Collective • Particular • Singular 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 38
Inverse Relationship between Comprehension and Extension COMPREHENSION (S-U) SUPPOSITION EXTENSION (U-S) INTENSION SUBSTANCE Substance Angel, Mineral, Plant, Brute, Man BODY Corporeal Substance Mineral, Plant, Brute, Man ORGANISM Animate Corporeal Substance Plant, Brute, Man ANIMAL Sentient Animate Corporeal Substance Brute, Man MAN Rational Sentient Animate Corporeal Substance Man 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 39
Inverse Relationship between Comprehension and Extension • Comprehension – Supposition – Stands for a definite one of the various things it can stand • Chair – Five letter word – Furniture – Chairman • Extension – Intension – Ascribed meaning • Giving example 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 40
Activity • Topic – Inverse Relationship between Comprehension and Extension • Each number contains a pair of terms. • Identify whether the terms are ordered according to Comprehension or Extension. • Arrange the following according to the order of Extension • Comprehension • Extension 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 41
Terms according to Meaning • Univocal – Same meaning • Human as Person and Human as Person • Analogous – Related meaning – Depends on application • Falling as motion and Falling as in love • Equivocal – Different meaning • Mouse of computer and Mouse in the hole of the house 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 42
Activity • Topic – Terms according to meaning • Instruction – 1. Classify the italicized term in the following sentences according to meaning. • Univocal • Analogous • Equivocal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 43
Terms according to Perfection • Precise – Exact manner • Triangle – Right Triangle • Imprecise – Not exact manner • Acute Triangle 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 44
Terms according to Perfection • Clear – Distinct manner • Man as rational being • Obscure – Vague – Indistinct manner • Man as talking animal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 45
Terms according to Perfection • Adequate – Man as rational being • Inadequate – Man as being 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 46
Terms according to Origin/ Formation • Immediate/ Intuitive – Direct observation of things • Water is liquid • Ice is solid • Mediate/ Abstracted – Matters of Faith • Man derives from ape • God is the beginning of all things 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 47
Terms according to Origin/ Formation • Explicit – Directly expressed • “I love you.” • Implicit – Directly implied – Matter of presumption • Kiss, Hug 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 48
Terms according to Origin/ Formation • Ideal/ Mental – Mind envisions • Heaven on earth • Classless society • Subjective/ Arbitrary – Personal thinking – Judgment of man • Man came from Adam • Real/ Objective – Factual reality • Woman Lawyer 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 49
Terms according to Relation • Identical – Same idea • Human Person and Rational being • Equivalent – Not the same formal features • Salt and Sodium Chloride 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 50
Terms according to Relation • Pertinent – Related to each other • Rationality and Learning • Freedom and Responsibility • Authority and Responsibility • Right and Obligation • Impertinent – Not related to each other • Intellect and Gender • Age and Maturity • Wisdom and Race 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 51
Terms according to Relation • Similar – Same extension but different comprehension • Coffee and Barako • Writer and Journalist • Compatible – Coexist in a subject • Beauty and Brain • Tall, Dark and Handsome • Reason and Faith • Incompatible – That cannot coexist • Sin and Holiness • Health and Sickness • Wisdom and Foolishness • Division of Incompatible Terms – Contradictory • Extremely opposite – Living and Dead – Hot and Cold – High and Low – Contrary • Opposed in certain order – Rich and Poor – Tall and Short – Privative • Concept and its defect – Sight and blindness – Hearing and deafness – Correlative • Mutual relation – Master and Servant – Husband and Wife – Student and Teacher 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 52
Terms according to Object • Real/ Concrete – Expresses something that has existential actuality • Chair, Table • Abstract/ Logical – Conceptual device to facilitate learning • Democracy • Arbitrary/ Imaginary – No correspondent reality • Spiderman, Flying Carpet • Metaphorical – Stand for an allied meaning • Lamb of God 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 53
Activity • Topic – Terms according to Comprehension, Relation and Object • Instruction – Identify the term according to comprehension, relation and object: • Compatible or Incompatible • Absolute/ Privative or Relative • Arbitrary or Real • Concrete or Abstract 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 54
Terms according to Quality • Positive Form, Positive Meaning (+) (+) – Life, Truth, Freedom • Positive Form, Negative Meaning (+) (-) – Happy-go-lucky • Negative Form, Negative Meaning (-) (-) – Illegal, Impolite • Negative Form, Positive Meaning (-) (+) – Immortal, Infinite 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 55
Activity • Topic – Terms according to Quality • Instruction – Classify the following terms according to Quality • (+) (+) – Positive Form, Positive Meaning • (+) (-) – Positive Form, Negative Meaning • (-) (-) – Negative Form, Negative Meaning • (-) (+) – Negative Form, Positive Meaning 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 56
Predicaments • Substance • Man, Dog, Plant • Accident – Quantity • 50 kg.; 100 pesos; 25 ft. long – Quality • intelligent, red, hot, strong, healthy, beautiful – Relation • father, husband – Action/ Activity • running, walking, dancing, driving – Passion • being killed, was shot, are burned, to be lifted – Time • now, today, at 8 pm, next week, noon, morning – Place • here, in the office, Davao, Manila, in the air – Posture/ Position • lying, standing, sitting – Habit/ Possession • in red gown, covered with lace , dressed, armed 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 57
Activity • Topic – Predicaments • Instructions • Identify the italicized terms according to its category/ predicaments. • Substance • Quantity • Quality • Relation • Action • Passion • Time • Place • Posture • Habit 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 58
Predicables • Genus – Specie in a class • E.g. Triangle is a polygon • Specific Difference – Differences of the specie from others • E.g. Triangle is three-sided • Species – complete essence of a thing • E.g. Triangle is a three-sided polygon • Accident – Something that attributes the thing by contingency • E.g. Acute Triangle • Property – Attribute • E.g. Triangle has 25 Degrees on each side 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 59
Judgment • Judgment – Mental operation that pronounces the agreement or disagreement between two ideas – E.g. • Square and Polygon – Square is a Polygon • Table and Chair – Table is not a Chair 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 60
Proposition • Subject statement – True or False • Logic is the study of the principles of correct reasoning. • Being a president is like riding a tiger. • Charles Dickens wrote Romeo and Juliet. 02/10/17 03:00 AM 61 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Proposition • Subject statement – Affirmed or Denied • God exists. • Atlantis uncovered. 02/10/17 03:00 AM 62 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Proposition • Subject statement – affirm or deny the attribute of a subject. • A dog is an animal. • A dog is not a cat. 02/10/17 03:00 AM 63 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Proposition • Subject statement – affirm or deny the relationships, connections between member propositions. • If it is raining, the ground is probably wet. 02/10/17 03:00 AM 64 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Activity • Topic – Proposition • Instruction – 1. Identify which of the following is a Proposition and which is not. – 2. Write P if the statement is proposition and N if it is not. – 3. Write the answer on the blank provided in each sentence. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 65
Activity • Topic – Proposition • Instruction – Establish whether this proposition is true or false. – Explain • True • False • True and False • I refuse to answer True or False 02/10/17 03:00 AM 66 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Types of Proposition • Causal • Modal • Inferential • Simple • Compound • Existential • Non-existential • Categorical • Hypothetical 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 67
Elements of Proposition • Subject – Something that is being talked about in the Proposition – Something that is denied or affirmed • Copula – Linking verb – Tense • Predicate – Something that talks about the Subject – Affirmed or denied by the Subject 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 68
Structure of Proposition • Quantifier (Form) – All • Subject (Matter) – students majoring in philosophy • Copula (Form) – are • Predicate (Matter) – required to take Metaphysicsand Epistemology 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 69
Quantifiers • Universal Quantifier – All ( Affirmative ) – Every ( Affirmative ) – Any ( Affirmative ) – No ( Negative ) – None ( Negative ) • Particular Quantifier – Some – At least one – Most – Almost all – The majority 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 70
Categorical Proposition • A (Universal-Affirmative) • All S are P – All politicians are honorable men. • I (Particular-Affirmative) • Some S are P – Some politicians are honorable men. • E (Universal-Negative) • All S are not P – All politicians are not honorable men. • O (Particular-Negative) • Some S are not P – Some politicians are not honorable men. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 71 Affirmative Negative Universal A E Particular I O
Double Negation • Negative + Negative = Positive • Offset Rule • Bullet and Train Method • E.g. – No man is not mortal by nature. – He who did not vote for Roxas last national election was not convinced of his leadership. • E.g. – No dogs that are without pedigrees are candidates for the blue ribbon in official dog shows. – Not all ordained ministers are not holy. – Nothing that is material is indestructible. – Most sins are not unforgivable. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 72
Modal Propositions • (A) Necessary Mode – An absolute being must exist. – It is necessary for cats to purr. • (E) Impossible Mode – Angels cannot be mortals. – It is impossible for squares to be circulars. • (I) Possible Mode – This car can run 300 mph. – It is possible for believer to become saints. • (O) Unnecessary Mode – It is not necessary for God to be creator just to become God. – It is contingent for tables to have four legs. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 73
Quality of Proposition • Not all – Particular Negative • Last but not the least – Affirmative 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 74
Hypothetical Proposition • Disjunctive Proposition – Either-or (+) (-) • The will is either free or determined. • Conjunctive Proposition – All cannot be true (-) (-) • You cannot work and play at the same time. • Conditional Proposition – If-then (+) (+) • If a man works, then he deserves the reward of his labor. • Biconditional Proposition – If and only if (+) (+) • You will pass this course if and only if you will study hard. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 75
Activity • Topic – Hypothetical Proposition • Instruction – 1. State the correct hypothetical proposition. • Conditional • Biconditional • Conjunctive • Disjunctive 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 76
Activity • Topic – Categorical Proposition I • Instruction – 1. Classify the following Proposition according to quantity, quality and symbol. • Quantity – Universal – Particular • Quality – Affirmative – Negative • Symbol – A – I – E – O 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 77
Activity • Topic – Categorical Proposition II • Instruction – 1. Give the correct symbol of the following categorical proposition. • A • I • E • O 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 78
Inference • Inference – The conclusion is reached – Meanings are already implied in the former • Non-inference – The conclusion is not reached • From the given premise: – The birds are flying south. – She graduated summa cum laude. – Lights are out and their car is gone. – The cat is standing by her dish meowing. • Infer the conclusion: – I suspect they are not home. – She is probably hungry. – Winter must be coming. – She must have studied hard in college. 02/10/17 03:00 AM 79 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Types of Inference • Immediate – Draws conclusion from any proposition • Opposition • Logical Proposition • Eduction – Interchanging the subject and predicate – Putting or removal of negatives • Mediate – Draws conclusion from series of proposition • Categorical Syllogism 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 80
Square of Opposites Every S is P No S is P Some S is P Some S is not P 02/10/17 03:00 AM 81 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. • Contrariety – Contraries • Contradiction – Contradictories • Subalternation – Subalterns • Subcontrariety – Subcontraries
Laws of Contradiction • Rule: – If A is true, O is false. – If E is true, I is false. – If A is false, O is true. – If E is false, I is true. – If O is true, A is false. – If I is true, E is false. – If O is false, A is true. – If I is false, E is true. – A - All dogs are animals. – O - Some dogs are not animals. – E - No women are married. – I - Some women are married. – O - Some prisoners are not guilty. – A - All prisoners are guilty. – I - Some apples are oranges – E - No apples are oranges. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 82
Laws of Contrariety • Rule: – If A is true, E is false. – If A is false, E is doubtful. – If E is true, A is false. – If E is false, A is doubtful. – A - All cats are animals. True – E - No cats are animals. False – E - No cats are dogs. True – A - All cats are dogs. False – A - All flowers are roses. False – E - No flowers are roses. False – E - No Catholic priests are ordained. False – A - All Catholic priests are ordained. True 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 83
Laws of Subcontrariety • Rule: – If I is false, O is true. – If I is true, O is doubtful. – If O is false, I is true. – If O is true, I is doubtful. – I - Some triangles are squares. False – O - Some triangles are not squares. True – O- Some students are not present. False – I - Some students are present. True – I - Some basketball players are tall. True – O - Some basketball players are not tall. True – O - Some scholars are not dumb. True – I - Some scholars are dumb. False 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 84
Laws of Subalternation • Rule 1: – If A is true, I is true. – If E is true, O is true. – If A is false, I is doubtful. – If E is false, O is doubtful. – A - All surgeons are doctors. True – I - Some surgeons are doctors. True – E - No beauty titlist is ugly. True – O - Some beauty titlists are not ugly. True – A - All students are scholars. False – I - Some students are scholars. True – E - No dogs are animals. False – O- Some dogs are not animals. False 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 85
Laws of Subalternation • Rule 2: – If I is false, A is false. – If O is false, E is false. – If I is true, A is doubtful. – If O is true, E is doubtful. – I - Some devils are good. False – A - All devils are good. False – O - Some angels are not spiritual. False – E - No angels are spiritual. False – I - Some oranges are fruits. True – A - All oranges are fruits. True – O - Some athletes are not swimmers. True – E - No athletes are swimmers. False 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 86
Chart – Opposition of Proposition A E I O A True T F T F E True F T F T I True D F T D O True F D D T A False F D D T E False D F T D I False F T F T O False T F T F 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 87
Activity • Topic – Square of Opposition • Instruction – Determine whether the following inferences are correct or incorrect – From the truth or falsity of the given statement, determine the symbol, judgment and relationship of the following statements – Indicate “The same proposition” if the relationship came from the same symbol and the same judgment – Encircle the symbol and judgment and write the relationship • Precision – Correct – Incorrect • Symbol – A – I – E – O • Judgment – True – False – Doubtful • Relationship – Contradiction – Contrariety – Subcontrariety – Subalternation 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 88
Eduction • Conversion – Switch S and P Symbol Statement Converse Truth Value E No S are P No P are S Same I Some S are P Some P are S A All S are P All P are S Undetermined O Some S are not P Some P are not S 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 89
Eduction • Obversion – Change the Quality – Negate P Symbol Statement Obverse Truth Value A All S are P No S are non P Same E No S are P All S are non P I Some S are P Some S are non P O Some S are not P Some S are not non P 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 90
Eduction • Contraposition – Switch and Negate S and P Symbol Statement Contrapositive Truth Value A All S are P All non P are non S Same O Some S are not P Some non P are not non S E No S are P No non P are non S Undetermined I Some S are P Some non P are non S 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 91
Eduction • Inversion 1 – Change the Quantity from Universal to Particular – Particular Quantity cannot be inversed – Change the Quality of Subject and Predicate Symbol Statement Inverse Truth Value A Every S is P Some non S is non P Same E Every S is not P Some non S is P I Cannot be inversed O 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 92
Eduction • Inversion 2 – Change the Quantity from Universal to Particular – Particular Quantity cannot be inversed – Change the Quality of Subject and Predicate Symbol Statement Inverse Truth Value A Every S is P Some non S is non P Same E Every S is not P Some non S is not non P I Cannot be inversed O 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 93
Activity • Topic – Eduction I • Instruction – 1. Identify the correct Eduction of the following proposition – 2. Write the letter of your choice on the space provided 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 94
Activity • Topic – Eduction II • Instruction – State the correct Eduction of the following proposition – Double Negation does not apply – Simplifying “Not all” to “Some” does not apply 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 95
Argument • Group of Proposition in which the Premises result in Conclusion. • Premise 1 – Anything that moves is moved by another; • Premise 2 – But, the ball moves; • Conclusion – Ergo, the ball is moved by another. 02/10/17 03:00 AM 96 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Structure of Argument • Premise 1 – Anything that moves is moved by another; • Given Proposition • Premise 2 – But, the ball moves; • reason of the conclusion • serves as the evidence • Conclusion – Ergo, the ball is moved by another. • Offshoot • Claim being made • followed the evidence 02/10/17 03:00 AM 97 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Not arguments • Raisins are dried grapes. Prunes are dried plums. • These are some of the symptoms of neurosis: strong guilt feeling, irrational fears, insomnia, and inability to make decisions. • It is sunny today. It is also the beginning of the week. 02/10/17 03:00 AM 98 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Good Argument • Conclusion is a result of Premise • Premise – It had rained yesterday, • Conclusion – Some places have been flooded. 02/10/17 03:00 AM 99 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Bad Argument • Conclusion is not a result of Premise • Premise – Identical twins who inherit the same genes have different intelligence quotient. • Conclusion – Environment must have played a role in determining intelligence. 02/10/17 03:00 AM 100 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Premise Indicators • since • because • for • as • follows from • as shown by • In as much as • as indicated by • the reason is that • may be inferred from • may be derived from • may be deduced from • in view of the fact that • in that • seeing that • given that • may be concluded from • on the reason that • due to the fact that • based on the premise that 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 101
Conclusion Indicators • therefore • hence • thus • so • wherefore, • accordingly, • in consequence • consequently • proves that • as a result • for this reason • it follows that • we may infer • I conclude that • which shows that • which means that • which entails that • which implies that • which allows us to infer • which points to the conclusion that • it must be that 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 102
Activity • Topic – Premise and Conclusion • Instruction – 1. Identify the premise and the conclusion in the following propositions – 2. Indicate the indicator of the respective premise and/ or conclusion – 3. Underline the Premise and Conclusion – 4. Write P above the Premise and C above the Conclusion – 5. Encircle the Indicator 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 103
Premise precedes Conclusion e. g. • Premise – The investigation of supernatural phenomena lies outside the realm of science. • Conclusion – Ergo, science can neither prove nor disprove the existence of God. 02/10/17 03:00 AM 104 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Premise precedes Conclusion e. g. • Premise – Because many are rightly concerned about the troublesome state of affairs that currently exists between Christian and Moslem in Egypt. • Conclusion – It is understandable to look to the legal system for help in addressing the problem. 02/10/17 03:00 AM 105 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Premise precedes Conclusion e. g. • Premise – Wisdom is the principal thing; • Conclusion – Ergo, seek the pursuit of wisdom. 02/10/17 03:00 AM 106 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Premise precedes Conclusion • shows that • indicates that • proves that • entails that • implies that • establishes that • Activity – Make propositions using these indicators. 02/10/17 03:00 AM 107 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Conclusion precedes Premise e. g. • Conclusion – The Food and Drug Administration should stop all cigarette sales immediately. • Premise – After all, cigarette smoking is the leading preventable cause of death. 02/10/17 03:00 AM 108 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Conclusion precedes Premise e. g. • Conclusion – Moreover, cutting SSS will not improve the deficit problem. As the Secretary of Department of Budget has noted, • Premise – Social security is funded by separate payroll taxes and contributes not a peso to the deficit. 02/10/17 03:00 AM 109 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Conclusion precedes Premise • Activity – Make propositions using these indicators. • is shown by • is indicated by • is proven by • is entailed by • is implied by • is established by 02/10/17 03:00 AM 110 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Activity • Topic – Premise precedes Conclusion and Conclusion precedes premise • Instruction – 1. Write N if it is not an argument. – 2. If it is an argument, write PC if the Premise precedes Conclusion. – 3. Write CP if the Conclusion precedes Premise 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 111
Statement to Argument • The president, being human, is mortal, as all human beings are mortal. • Premise 1 – All human beings are mortals. • Premise 2 – The president is a human being. • Conclusion – Ergo, the president is mortal. 02/10/17 03:00 AM 112 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Statement to Argument • God does not exist because if he did there would be no suffering and evil in the world; but obviously suffering and evil do exist. Thus, there is no God. • Premise 1 – If God existed there would be no suffering and evil in the world. • Premise 2 – But obviously suffering and evil do exist. • Conclusion – Ergo, there is no God. 02/10/17 03:00 AM 113 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Statement to Argument • All mammals feed their young with milk. All humans are mammals. Ergo, all humans feed their young with milk. • Activity – Transform the statement into an argument. 02/10/17 03:00 AM 114 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Statement to Argument • All that feed their young with milk are mammals. All humans feed their young with milk. Ergo, all humans are mammals. • Activity – Transform the statement into an argument. 02/10/17 03:00 AM 115 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Reasoning • Reasoning – Mental operation in which propositions are compared into order to create a meaningful conclusion. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 116
Validity of Reasoning • Rules: – The conclusion should flow from the material content of the premise – An argument containing true premises cannot have a false conclusion • Valid E.g. – All sharks are ferocious animals. – However, some sea creatures are sharks. – Ergo, some sea creatures are ferocious animals. • Invalid E.g. – All stars are heavenly bodies. – However, Angelina Jolie is a star. – Ergo, Angelina Jolie is a heavenly body. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 117
Activity • Topic – Validity of Reasoning • Instruction – Identify whether the argument is Valid or Invalid 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 118
Types of Reasoning • Deduction – From General to Specific – Determines whether the argument is Valid of Invalid – Core of Aristotelian Logic – E.g. • All businessmen are millionaires • However, some businessmen are Filipinos • Ergo, some Filipinos are millionaires. • Induction – From Specific to General – Philosophy of Francis Bacon and John Stuart Mill – Determines whether the argument is correct or incorrect. – E.g. • Juan is a Filipino • Juan is a hardworking man. • Ergo, probably all hardworking men are Filipinos. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 119
Kinds of Reasoning • Deductive – Conclusion follows necessarily from premise. – Premise supports conclusion because it is true. – Because it is impossible for the conclusion to be false. • Inductive – Conclusion follows probably from premise. – Premise supports conclusion because of it is assumedly true. – Because it is probable for the conclusion to be true. 02/10/17 03:00 AM 120 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
Deductive • Indicators – Necessarily – Certainly – Absolutely – Definitely • E.g. – If a substance is a noble gas, it is inert. Therefore, since argon is a noble gas, it necessarily follows that it is inert. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 121
Inductive • Indicators – Probable – Improbable – Plausible – Implausible – Likely – Unlikely • E.g. – Neon has unstable isotopes. Therefore, since argon is similar in many ways to neon, it probably follows that argon has unstable isotopes, too. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 122
Deductive vs. Inductive • Deductive – Premise 1 • All saleswomen are extroverts. – Premise 2 • Judy Wage is a saleswoman. – Conclusion • Therefore, she is extrovert. • Inductive – Premise 1 • The vast majority of saleswomen are extroverts. – Premise 2 • Rose Liam is a saleswoman. – Conclusion • Therefore, she is extrovert. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 123
Deductive and Inductive • Arguments with no indicator – Depends on the Matter 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 124
Forms of Deductive Reasoning • Argument based on mathematics – An argument in which the conclusion depends on some purely arithmetic or geometric computation or measurement. • E.g. – A shopper may place two apples and three oranges into a paper bag and then conclude that the bag contains five fruits. – A surveyor might measure a square piece of land and, after determining that it is 100 feet on each side, conclude that it contains 10,000 square feet. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 125
Forms of Deductive Reasoning • Argument from definition – An argument in which the conclusion is claimed to depend upon the definition of some word or phrase used in the premise or the conclusion • E.g. – Claudia is mendacious, so she tells lies. – This paragraph is prolix, so it follows that it is excessively wordy. • Dictionary: – Mendacious • Liar – Prolix • Prolonged 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 126
Forms of Deductive Reasoning • Categorical syllogism – A syllogism in which each statement begins with one of these quantifiers: • All • No • E.g. – Premise 1 • All lasers are optical devices. – Premise 2 • Some lasers are surgical instruments. – Conclusion • Therefore, some optical devices are surgical instruments. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 127
Forms of Deductive Reasoning • Conditional syllogism – A syllogism having a conditional statement for one or both of its premises. • E.g. – Premise 1 • If quartz scratches glass, then quartz is harder than glass. – Premise 2 • Quartz scratches glass. – Conclusion • Therefore, quartz is harder than glass. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 128
Forms of Deductive Reasoning • Disjunctive syllogism – A syllogism having a disjunctive statement (“either...or”) for one or both of its premises. • E.g. – Premise 1 • Either breach of contract is a crime or it is not punishable by the state. – Premise 2 • Breach of contract is not a crime. – Conclusion • Therefore, it is not punishable by the state. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 129
Forms of Inductive Reasoning • Prediction – The premises deal with some known event in the present or past, and the conclusion moves beyond this event to some event in the relative future. • E.g. – Because certain meteorological phenomena have been observed to develop over a certain region in the Pacific, a storm will occur there in the next several hours. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 130
Forms of Inductive Reasoning • Argument from analogy – An argument that depends on the analogy between two things. • E.g. – From knowledge that his Mercedes car is an expensive car, I argue that your car, being a Mercedes, is also expensive. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 131
Forms of Inductive Reasoning • Inductive generalization – An argument that proceeds from the knowledge of a selected sample to some claim about the whole group. Because the members of the sample have a certain characteristic, it is argued that all the members of the group have the same characteristic. • E.g. – One may argue that because three oranges selected from a certain crate were especially tasty and juicy, all the oranges from that crate are especially tasty and juicy. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 132
Forms of Inductive Reasoning • Argument from authority – An argument in which the conclusion rests upon a statement made by some presumed authority or witness. • E.g. – A lawyer may argue that the suspect committed no murder because an eyewitness testified to that effect under oath. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 133
Forms of Inductive Reasoning • Argument based on signs – An argument that proceeds from the knowledge of a certain sign. • E.g. – When driving on an unfamiliar highway, one might see a sign indicating that the road makes several sharp turns one mile ahead. Based on this information, one might argue that the road does indeed make several sharp turns one mile ahead. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 134
Forms of Inductive Reasoning • Causal inference – An argument that proceeds from the knowledge of a cause to knowledge of the effect – An argument that proceeds from the knowledge of an effect to knowledge of a cause. • E.g. Cause to effect – From the knowledge that a bottle of wine had been accidentally left in the freezer overnight, someone might conclude that it had frozen. • E.g. Effect to Cause – after tasting a piece of chicken and finding it dry and crunchy, one might conclude that it had been overcooked. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 135
Activity • Topic – Kinds of Reasoning • Instruction – 1. Identify whether the argument is Deductive or Inductive – 2. Indicate the form of the respective argument – 3. Write the answer on the blank provided in each sentence. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 136
Syllogism • Syllogism – Deductive Argument – Composed of three proposition • Major Premise – Consist of Predicate Term of the Conclusion and a Middle Term – Usually begin with Universal quantifier • Minor Premise – Consist of Subject Term of the Conclusion and a middle term • Conclusion – Composed of: » Predicate of the Major premise » Subject of the Minor Premise 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 137
Perfect Syllogism • Categorical – Simple – Compound • Hypothetical – Conditional – Conjunctive – Disjunctive 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 138
Components of Syllogism • Major Premise – All men are mortal. (M) (T) • Minor Premise – All Filipinos are men. (t) (M) • Conclusion – Ergo, all Filipinos are (t) mortal. (T) • Major Term (T) – Predicate of the Conclusion – Occurrence: Conclusion and One of the Premise • Minor Term (t) – Subject of the Conclusion – Occurrence: Conclusion and in the Premise where the Major Term does not occur • Middle Term (M) – Unites the Major and Minor Term – Does not occur in the Conclusion – Occurrence: Major and Minor Premise 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 139
Steps in Categorical Syllogism • Major Premise – All men are mortal. (M) (T) • Minor Premise – All Filipinos are men. (t) (M) • Conclusion – Ergo, all Filipinos are (t) mortal. (T) • 1. Look for Conclusion • 2. Predicate in Conclusion – Major Term (T) • 3. Subject in Conclusion – Minor Term (t) • 4. Premise with the Major Term (T) – Major Premise • 5. Premise with the Minor Term (t) – Minor Premise • 6. Common Term in the Major Premise and Minor Premise – Middle Term (M) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 140
Activity • Topic – Categorical Syllogism Steps • Instruction – 1. Identify the Major Premise, Minor Premise and Conclusion. – 2. Underline and identify the Major Term (T), Minor Term (t) and Middle Term (M) using the proper symbols following the Steps in Categorical Syllogism. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 141
Rules of Categorical Syllogism • Rule No. 1 – There must be only three categorical proposition • All golds are metals. • All jewelries are golds. • Ergo, all jewelries are metals. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 142
Rules of Categorical Syllogism • Rule No. 2 – There must be only three univocal terms, each of which occurs twice but not in the same proposition • All flowers are beautiful. (M) (T) • Tulip is a flower. (t) (M) • Tulip is beautiful. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 143
Rules of Categorical Syllogism • Rule No. 3 – The middle term must be distributed (Universal) at least once • All trees are plants. (M) (T) • All Bonsai are trees. (t) (M) • Ergo, all Bonsai are plants. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 144
Rules of Categorical Syllogism • Rule No. 4 – If the term is distributed (Universal) in the conclusion, then such term must be distributed (Universal) in a premise • Major and Minor terms must not be universal in the conclusion if they are not universal in the premises. • Some metals are cars. (M) (T) • All robots are metals. (t) (M) • Ergo, all robots are cars. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 145
Rules of Categorical Syllogism • Rule No. 5 – There must be no two particular premises; one premise must be universal • Some metals are gold. (M) (T) • All rings are metals. (t) (M) • Ergo, all rings are gold. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 146
Rules of Categorical Syllogism • Rule No. 6 – If one premise is particular, the conclusion must be particular • Some stones are pearl. (M) (T) • All crowns are stones. (t) (M) • Ergo, some crowns are pearl. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 147
Rules of Categorical Syllogism • Rule No. 7 – If the conclusion is negative, only one premise must be negative • All stars are cute. (T) (M) • Some comedians are not cute. (t) (M) • Ergo, some comedians are not stars. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 148
Rules of Categorical Syllogism • Rule No. 8 – If the conclusion is affirmative then both premises must be affirmative • All legislators are senators. (t) (M) • All senators are honest. (M) (T) • Ergo, all legislators are honest. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 149
Activity • Topic – Categorical Syllogism Rules • Instruction – 1. Identify the Rule Violated in the following Categorical Syllogism – 2. Write the rule statement beside the given Syllogism. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 150
Figures of Categorical Syllogism 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 151 Figure 1 Figure 2 M P S M S P P M S M S P Figure 3 Figure 4 M P M S S P P M M S S P
Moods of Categorical Syllogism • Valid Moods of Figure 1 – AAA Barbara – AII Darii – EAE Celarent – EIO Ferio • Valid Moods of Figure 2 – AOO Baroco – AEE Camestres – EAE Cesare – EIO Festino 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 152
Moods of Categorical Syllogism • Valid Moods of Figure 3 – AAI Darapti – AII Datisi – EAO Felapton – EIO Ferison – IAI Disamis – OAO Bocardo • Valid Moods of Figure 4 – AAI Bramantip – AEE Camenes – EAO Fesapo – EIO Fresison – IAI Dimaris 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 153
Activity • Topic – Categorical Syllogism - Figures and Moods • Instruction – 1. Determine the Figures and Moods of the following Categorical Syllogism – 2. Write your answer of the space provided 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 154
Hypothetical Syllogism • Hypothetical Syllogism – Contains major premise that is hypothetical proposition – Forms: • Conditional Syllogism • Conjunctive Syllogism • Disjunctive Syllogism • E.g. – If penguins are birds then they have feathers and wings. – However, penguins are birds. – Ergo, they have feathers and wings. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 155
Conditional Syllogism • Conditional Syllogism – Have conditional major premise – Indicators: • If then – Modus Ponens • Posit the antecedent and the consequent – Structure • S P • S • P • E.g. Valid – If you are beautiful then you have many admirers. – However, you are beautiful – Ergo, you have many admirers. • E.g. Invalid – If you are beautiful then you have many admirers. – However, you have many admirers. – Ergo, you are beautiful. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 156
Conditional Syllogism • Conditional Syllogism – Have conditional major premise – Indicators: • If then – Modus Tollens • Sublate the consequent and antecedent – Structure • S P • P • S • E.g. Valid – If you are an athlete then you are energetic. – However, you are not energetic. – Ergo, you are not an athlete. • E.g. Invalid – If you are an athlete then you are energetic. – However, you are not an athlete. – Ergo, you are not energetic. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 157
Activity • Topic – Conditional Syllogism • Instruction – Identify whether the argument is a valid Modus Ponens or Modus Tollens 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 158
Conjunctive Syllogism • Conjunctive Syllogism – Indicator: • And – Ponendo-Tollens • Posit one term of the major premise in the minor premise • Sublate one term of the major premise in the conclusion – Structure • Positive Minor Premise • Negative Conclusion • E.g. Valid – You cannot be a manager and a janitor at the same time – However, you are a manager. – Ergo, you are not a janitor. • E.g. Invalid – You cannot be a manager and a janitor at the same time – However, you are not a manager. – Ergo, you are a janitor. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 159
Activity • Topic – Conjunctive Syllogism • Instruction – Identify whether the argument is Valid or Invalid 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 160
Disjunctive Syllogism • Disjunctive Syllogism – Indicators: • Either or – Ponendo-Tollens • Minor premise posits a member of major premise • Conclusion must Sublate the other remaining member – Structure • Major Premise cannot be both true in Minor Premise and Conclusion • Positive Minor premise • Negative Conclusion • E.g. Valid – Man is either biped or quadruped. – However, man is biped. – Ergo, man is not quadruped. • E.g. Invalid – Man is either biped or quadruped. – However, man is biped. – Ergo, man is quadruped. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 161
Activity • Topic – Disjunctive Syllogism • Instruction – Identify whether the argument is Valid or Invalid 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 162
Imperfect Syllogism • Polysyllogism – Enthymeme • First Order • Second Order • Third Order – Sorites • Aristotelian • Goclenian – Dilemma • Simple • Complex – Epichireme • Explained with: – Because – Since – Insofar – In as much02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 163
Enthymeme • First Order – Major Premise is omitted • Second Order – Minor Premise is omitted • Third Order – Conclusion is omitted • E.g. – Given: • Every artist is imaginative. • However, Picasso is an artist. • Ergo, he is imaginative. – First Order • Picasso is an artist. • Ergo, he is imaginative. – Second Order • Every artist is imaginative. • Ergo, Picasso is imaginative. – Third Order • Every artist is imaginative. • Picasso is an artist. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 164
Activity • Topic – Enthymeme • Instruction – Fill the three orders of Enthymeme 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 165
Sorites • Aristotelian Sorites – Predicate of the Premise is the Subject of the Series of Conclusion excluding Final Conclusion – Final Conclusion is composed of: • Subject of the First Premise • Predicate of the Last Conclusion • Goclenian Sorites – Reverse of Aristotelian Sorites – Subject of the Premise is the Predicate of the Series of Conclusion excluding Final Conclusion – Final Conclusion is composed of: • Subject of the Last Conclusion • Predicate of the First Premise • E.g. Aristotelian Sorites – Philippines is an archipelago. – An archipelago is a land surrounded by water. – A land surrounded by water is an island. – An island is a mass of land. – A mass of land is not an ocean. – Ergo, Philippines is not an ocean. • E.g. Goclenian Sorites – A mass of land is not an ocean. – An island is a mass of land. – A land surrounded by water is an island. – An archipelago is a land surrounded by water. – Philippines is an archipelago. – Ergo, Philippines is not an ocean. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 166
Activity • Topic – Sorites • Instruction – Identify whether the syllogism is Aristotelian Sorites or Goclenian Sorites 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 167
Fallacy Illicit Process • Fallacy Illicit Process – Violates the rules of distribution – Term appears to be Universal or Particular in the Conclusion, but not in the Premise – Positive Proposition makes Particular Predicate – Negative Proposition makes Universal Predicate • Fallacy Illicit Major • Fallacy Illicit Minor • Fallacy of Undistributed/ Particular Middle 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 168
Fallacy Illicit Major • Fallacy Illicit Major – Violates the rules of distribution – Major Term appears to be Universal or Particular in the Conclusion, but not in the Major Premise – Positive Proposition makes Particular Predicate – Negative Proposition makes Universal Predicate • E.g. – All dogs are mammals. • Middle Universal + Major Particular – No cats are dogs. • Minor Universal - Middle Universal – Ergo, no cats are mammals. • Minor Universal - Major Universal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 169
Fallacy Illicit Minor • Fallacy Illicit Minor – Violates the rules of distribution – Minor Term appears to be Universal or Particular in the Conclusion, but not in the Minor Premise – Positive Proposition makes Particular Predicate – Negative Proposition makes Universal Predicate • E.g. – All cats are felines. • Middle Universal + Major Particular – All cats are mammals. • Middle Universal + Minor Particular – Ergo, all mammals are felines. • Minor Universal + Major Particular 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 170
Fallacy of Undistributed Middle • Fallacy of Undistributed/ Particular Middle – Violates the rules of distribution – Only one Middle Term must be Particular – Positive Proposition makes Particular Predicate – Negative Proposition makes Universal Predicate • E.g. – All mammals are animals. • Major Universal + Middle Particular – Some animals are brute. • Middle Particular + Minor Particular – Ergo, not all brute are mammals. • Minor Particular - Major Universal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 171
Debate • Structure of Debate – Constructive Speech • Affirmative first contender – Interpellation – Question » Destroy – Answer » Defend 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 172
Debate• Types of Debate – Lincoln-Douglas/ Two men debate • 1 Affirmative and 1 Negative – Rebuttal • 3 Members per side • All members can rebut the speaking opponent except the 1st affirmative who will close the debate – Parliamentary/ Oregon-Oxford • 3 Speakers • 1st speaker affirmative starts the debate and be interprellated by the 1st Speaker negative. • 1st speaker negative starts and be interprellated by 2nd speaker affirmative and so on. • 1st speaker affirmative will interprellate the last negative speaker and will close the debate. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 173
Debate– Valid Objections • Objection Your Honor/ Mr. Moderator, the question is: – Irrelevant/ Misleading/ Beyond the scope of the topic » Question is nothing to do with the topic » Purposely throwing off track the topic – Vague and Kilometric » Question could not be understood – Immaterial/ Has no basis/ Hearsay » Doubtful evidence – Hypothetical » Based on assumptions – Calling for Opinion » Speculation » Personal » Beyond expertise – Calling for two extremes » Misleading choices – Argumentative » Cannot be proven – Badgering » Shouting » No room for answer – Leading » Complex Question – Repulsive to the Senses » Pictures of dead, garbage, etc. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 174
Debate – Qualifications • Your Honor/ Mr. Moderator – May I qualify my answer? The question is complex. – Questions • Structured – Series of deductions • Single – Seeking evidence that opponent does not have • Straw – Rapid Fire » Rattles and Pressure the other side • Rebuttal Speech • Team Captain of both sides – Fallacies • Accidents • False Cause • Consequent • Complex Question • Begging the Question • Absolute • Ad Hominem • Ad Populum • Misericordiam • Ad Verecundiam • Ad Baculum • Ad Ignorantiam • Non-sequitor 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 175
Topics for Debate • Should abortion be legal? • Should death penalty be allowed? • Should prostitution be legal? • Should euthanasia be allowed? • Should gay marriage be legal? • Should divorce be legal? • Should marijuana be legal? • Should sex education be allowed? • Is animal testing justified? • Should polygamy be legal? • Is social networking good for society? • Is age important factor in relationship? • Is male superior to female? • Is money more important than love in marriage? • Should housewives be allowed to be bread winner? • Should homework be banned? • Should Priest be allowed to marry? • Should Seminarians be allowed to have girlfriends? • Does God exist? 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 176
Fallacy • Fallacy – In English term • Error • Prejudice • Mistaken Impression • Illusion • Fallacy – In Logical term • Fallere (Latin) to deceive • Error of reasoning • Inadequate evidence for the conclusion. • False argument that has the appearance of truth • Paralogism or ignorance • Mistake in reasoning – Mistake in judgment 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 177
Sophism • Sophism – Sophistry – Fallacy committed with the intention to deceive or mislead an opponent 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 178
Formal Fallacies • Fallacies of Ambiguity – Fallacies of clearness – Contain ambiguous words or phrases – Confusion in the meaning of words • Logical Fallacies 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 179
Dichotomy • “Either . . . Or” statement is used • The alternatives are falsely presented exhaustively • Eliminating the undesirable alternative, leaving the desirable alternative • E.g. – Either you let me have a grand debut party or I will be miserable for the rest of my life. I know you do not want me to be miserable for the rest of my life, so it follows that you will have me a grand debut party. – Either you will cheat or fail in the examination. Surely you do not want to fail the examination. Therefore, you will cheat. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 180
Equivocation • The same word or phrase is used with two or more meanings • E.g. – A law can be repealed by legislative authority. The law of gravity is a law. Therefore, the law of gravity can be repealed by the legislative authority. – No designing persons are to be trusted; But, architects are people who make designs; Therefore, architects are not to be trusted. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 181
Amphiboly • The grammatical construction of a sentence is not clear and is therefore open to different interpretation • E.g. – John told Bob that he had made a mistake. It follows that John has at least the courage to admit his own mistakes – My mother told your mother that she should go to the SSS office – The dog of a lady with long tail is lost 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 182
Composition • What is true of the parts of a whole is also true of the whole thing • Taking collectively what should be taken individually • The whole is this because the parts are these • E.g. – A feather is light. Therefore, a plastic containing a billion feathers is light. – Each member of the orchestra is excellent, so the orchestra is excellent. – Each player on this basketball team is an excellent athlete. Therefore, the team as a whole is excellent. – Every atom in my body is invisible. Therefore, I am invisible. – Each brick in this building is rectangular in shape. Ergo, this building must be rectangular in shape. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 183
Division • What is true of the whole is also true of the parts of the whole thing • Taking individually what should be taken collectively • The parts are these because the whole is this • E.g. – Salt is a nonpoisonous compound. Therefore, its component elements, sodium and chlorine, are non- poisonous. – The senate passed the RH Law. Ergo, every member of the senate is in favor to it. – Humans are the only animals capable of philosophical thinking. Thus, every person is capable of philosophical thinking. – Since a nation is powerful, every individual citizen of that nation is powerful.02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 184
Accent • Arises from the mistaken interpretation of a statement but the mistake is due to the ambiguity in the way the statement is spoken • The arguer illegitimately stresses one or more words in the given statement and then proceeds to draw a conclusion based on the resultant interpretation • E.g. – Woman without her man is useless. – Recycle clothes and waste paper. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 185
Prosody • Contains a word that is: – Misleading – Confusing • E.g. – Thou shall not covet thy neighbor's wife. However, Mr. Santos is not my neighbor. Ergo, I can covet his wife. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 186
Figure of Speech • Argues from the construction of one word to the form and the construction of another • E.g. – Insecure is contradictory of secure. Insincere is also the contradictory of sincere. Ergo, inflammable is the contradictory of flammable. – Anybody restless is not restful. Anybody careless is not careful. Ergo, anybody helpless is not helpful. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 187
Informal Fallacies • Fallacies of Relevance – Overlooks the fact – No connection between the premises and the conclusion – Argument relies on premises that are not relevant to its conclusion and ergo cannot establish its truth • Material Fallacies 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 188
Argumentum ad baculum • Appeal to force – Use of threat • physical or psychological – Physical force or moral pressure rather than the merit of the point at issue – Discourse of power – Pointing out their powers over you – Warning you of the bad consequences of refusing to accept their argument • E.g. – Thus there is ample proof of the truth of the Bible. All those who refuse to accept that truth will burn in Hell. – Ladies and gentlemen of the jury, if you do not bring in a verdict of guilty, you may be this killer’s next victim! 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 189
Argumentum ad baculum • Appeal to force – Use of threat • physical or psychological – Physical force or moral pressure rather than the merit of the point at issue – Discourse of power – Pointing out their powers over you – Warning you of the bad consequences of refusing to accept their argument • E.g. – Be home by nine tonight or you can forget about the increase in allowance next week. – You better agree to my proposal or you won't see your family anymore. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 190
Argumentum ad baculum • Appeal to force – Use of threat • physical or psychological – Physical force or moral pressure rather than the merit of the point at issue. – Discourse of power – Pointing out their powers over you – Warning you of the bad consequences of refusing to accept their argument. • E.g. – You have just heard the new policies in our company. They are effective immediately. Anyone who disagrees may now resign. The portal of the company is open. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 191
Argumentum pansarilum • Argument to one’s own advantage – Offer would be heed unless advantage will be given regardless of morality • E.g. – I will pay for your mother’s hospital bill provided that we will sleep together tonight 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 192
Argumentum ad misericondiam • Appeal to pity – Causes sympathy – Pleading for mercy and disregarding the point in argument – Pity or sympathy must be irrelevant to the issue • Relevant – Hungry beggar who begs for food – A man who on bended knees appeals to a criminal to spare his life • E.g. – We cannot condemn this man because he is the only one that supports his family. – I did not murder my mother and father with an axe! Please don't find me guilty; I'm suffering enough through being an orphan. – Imelda Marcos cries over jury on Yamashita trial. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 193
Argumentum ad misericondiam • Appeal to pity – Causes sympathy – pleading for mercy and disregarding the point in argument – Pity or sympathy must be irrelevant to the issue • Relevant – Hungry beggar who begs for food – A man who on bended knees appeals to a criminal to spare his life • E.g. – A student should be given a passing grade because he is soon to graduate, or because if he fails the course his parents would disown him. – Vote for this candidate because he has already put in a lot of money and heartache in the campaign. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 194
Argumentum ad misericondiam • Appeal to pity – Causes sympathy – Pleading for mercy and disregarding the point in argument. – Pity or sympathy must be irrelevant to the issue • Relevant – Hungry beggar who begs for food – A man who on bended knees appeals to a criminal to spare his life • E.g. – I hope you could add more compassion in your heart by letting me pass in this bar examination. Anyway, I am already old. To retire as a full-pledge lawyer is all I dream of. – Please accept me to work in your company. I have 5 children to feed and my wife is bed ridden. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 195
Argumentum ad crumenam • Believing that money is a criterion of correctness • Those with more money are more likely to be right • E.g. – Microsoft software is undoubtedly superior; why else would Bill Gates have gotten so rich? – Apple must be the best manufacturer of quality gadgets, why else would it be so expensive? – Give me a passing mark Sir, and we will talk about the payment. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 196
Argumentum ad lazarum • Lazarus – Jesus raised from being dead • Assuming that someone poor is sounder or more virtuous than someone who's wealthier • E.g. – Priests are more likely to possess insight into the meaning of life, as they have given up the distractions of wealth. – Tenants of Hacienda Luisita should be given a parcel of land from the vast land of Cojuanco because they have work hard on it. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 197
Argumentum ad populum • Appeal to the people or appeal to emotion – Enthusiasm and emotional support – Attempts to win popular assent using emotive language – Mobilizing public sentiment – Direct or Indirect • E.g. – Legalize cockfighting because many people are engaging in it anyway. – The constitution is defective because many people want it to be amended. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 198
Argumentum ad populum • Direct – Excite the emotion and enthusiasm of the crowd – Arouse a kind of mob mentality – Employs emotional charge phraseology • E.g. – Political campaigns • Iboto si Jingoy Estrada, Anak ng Ama ng masa, Anak ng bawat masa. – Slogans – Labels 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 199
Argumentum ad populum • Indirect – Appeal is addressed to one or more individuals separately • E.g. – Bandwagon • 9 out of 10 Moms trust Lactum. You will be left behind if you do not use the product. – Vanity • “Only Belo touches my skin.” – Kris Aquino – Snobbery • An apple gadget is not for everyone. If you think you belong to the select few, this distinguished smart phone is for you! 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 200
Argumentum ad antiquitatem • Antique – Old • Asserting that something is right or good simply because it's old • That's the way it's always been • E.g. – For thousands of years Christians have believed in Jesus Christ. Christianity must be true, to have persisted so long even in the face of persecution. – UST must be the best institution for being the oldest in Asia. – UIC must be guided by the holy spirit because it stands for a century. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 201
Argumentum ad novitatem • Novitiate – New • Asserting that something is better or more correct simply because it is new • E.g. – The Clash of Clans is way cooler than Super Mario because it was just in market last week. – Kia vehicles are more durable than Toyota vehicles because it is the newest brand in the market. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 202
Poisoning the well • No chance has the second man got if the first man calls him a liar before he even begins talking • E.g. – Two men are having a debate. The first one gets up and says, 'My opponent is a notorious liar. You can't believe a word that he is going to say.' 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 203
Argumentum ad hominem • Attack against the person – Attack is not at the conclusion of an opponent but at the person of the opponent himself – Attack upon the person rather than the persons’ ideas. – What he says should not be believed because of his character flaw – Attacking the person instead of proving or disproving the point at issue • Abusive • Circumstantial • Tu quoque 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 204
Argumentum ad hominem • Abusive – Attack is directly against a person seeking to defame or discredit him • Opponent possesses a certain undesirable or negative characteristic • Opponents’ words or abilities are not to be trusted because of that characteristic • E.g. – Well now, you have all heard Professor Clark tell us about the theory of evolution. But I am not surprised that he neglected to tell you that he is a godless atheist! How can this man speak the truth, I ask you? 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 205
Argumentum ad hominem • Circumstantial – Opponent has self- centered interest on the topic • E.g. – The mall industry lobbyists have been arguing that tax reform is not necessary. But just remember this: it is the mall industry that stands to benefit the most if there is no change in the current tax laws. – A student of UM predicts that the basketball team of ADDU will win the championship match. A fellow student of UM might raise his eyebrows and ask him, "Where does your loyalty belong to, anyway?"02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 206
Argumentum ad hominem • Tu quoque – Shifting the burden of guilt – One defends oneself by accusing the attacker of usually similar wrongdoing. – “Two wrongs do not make a right” so that even if the arguer is right in attacking his accuser, he has not defended himself against the charge – Character of an individual is logically irrelevant to the truth or falsehood of what the person says – May persuade by the psychological process of transference • E.g. – Yes, I admit, I cheated on you last night. But you also cheated on me before. – You say I’m not pretty? Well, you’re not pretty as well. How can you be in the position to say that? 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 207
Argumentum ad vercundiam • Appeal to misplaced or inappropriate authority – Claimant is not authorized to discuss the subject matter – Based not on the intrinsic merits of the claim but on the prestige or fame of the person endorsing the claim – Appeal to authority with respect to matters outside his specialization • E.g. – How can that definition of love be questioned, criticized or doubted when it was Blaise Pascal, a known mathematician who gave that. – My assignment in Logic is not wrong. Miss Rowling, my English teacher who is known internationally as a novelist, confirmed my answer. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 208
Critique on Argumentum ad vercundiam by Prof. Sam Bernales, Jr. • Defending the misplaced or inappropriate authority – Claimant may not be an expert to discuss the subject matter but the argument may be accepted based on the person’s passion on the subject matter. • E.g. – Giorgio Tsoukalos of Ancient Aliens, History Channel, discusses about the presence of Aliens in Ancient History of the World. Giorgio Tsoukalos is a graduate of Bachelor of Arts in Mass Communication major in Sports Communication. However, he still merited by the prestigious History Channel based on his enthusiasm on the subject. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 209
Argumentum ad ignorantiam • Appeal to ignorance – Proposition is true • because it has not been proved false – Proposition is false • because it has not been proved true – Lack of evidences • E.g. – Well, I have examined all the arguments for the existence of God, and I have seen that none of them proves that God exists. That is reason enough for me: there is no God! – Angela Frank is a paragon of honesty because she never cheats. – I am sure that the students have understood the instructions perfectly well because no one raised a hand to ask anything on my lesson. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 210
Dicto simpliciter • Accident – A general rule is applied wrongly to a specific case – From general to particular • E.g. – Jogging is good for the health. Ergo, a newly-heart-operated patient should always jog for good health. – Freedom of speech is a constitutionally guaranteed right. Therefore, that radical communist should not be arrested for his speech that incited that riot last week. – All good soldiers should obey their superiors' orders. Therefore, they should also obey the captain even if he is exceedingly in authority. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 211
Dicto simpliciter • Accident – A general rule is applied wrongly to a specific case – From general to particular • E.g. – One has to tell the truth always. Thus, if a murderer confesses his crime to a priest, it is but proper for the priest to reveal the truth to the authority. – Customer is always right. Therefore, the cashier should return my money because I changed my mind after purchase. – A good student abides the teacher. Ergo, a beautiful student should abide the teacher who implies indecent favor. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 212
Dicto simpliciter • Accident – A general rule is applied wrongly to a specific case – From general to particular • E.g. – Killing is immoral. Ergo, soldiers and policemen should not kill in the face of threat. – Households should obey their masters. Ergo, domestic helpers should obey their masters imposing sexual assault. – Every citizen has the right to bear arms. Ergo, Sisa, who has been declared insane, should not be disarmed. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 213
Dicto simpliciter • Accident – Accident is given more emphasis rather than the Essence • E.g. – Mr. Estrada is not my father. My father is not a drunkard, a womanizer and a gambler. – You are not my boyfriend. I have no cheating boyfriend. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 214
Converse accident • Hasty generalization – Conclusion is drawn out of the sample that is not a representative of the group – One moves carelessly or too quickly from a single case to a broad generalization – From particular to general • E.g. – I know that Philosophers are weird and odd people because I have seen that in my teachers behavior. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 215
Post hoc • False Cause – The link between premises and conclusion depends on some imagined causal connection that does not exist – Superstitious beliefs or Oversimplification • E.g. – It rains whenever she arrives, ergo to avoid rains we must not invite her to come over. – During the past two months, every time that the cheerleaders wore blue ribbons in their hair, the basketball team was defeated. Therefore, to prevent defeats in the future, the cheerleaders should get rid of those blue ribbons. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 216
Post hoc • False Cause – Superstitious beliefs • Cultural • Pass on from one generation to another • E.g. – He met an accident because it was Friday the 13th . – A black cat crossed my path and later I tripped and sprained my ankle. It must be that black cats are really bad luck. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 217
Post hoc • False Cause – Oversimplification • An arguer explains the occurrence of some event or phenomenon in terms of one or more of its least important causes • E.g. – I blame the television media for the epidemic of hijackings, kidnappings, and other acts of terrorism. If we would stop televising terrorist acts, they would stop. – The divorce rate in America has been climbing steadily. At the same time, the number of juveniles getting into trouble with the law has shoot up. Something must be done about the divorce rate since it is causing such a rapid increase in juvenile delinquency. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 218
Non-sequitor • It does not follow – Conclusion does not necessarily follow from our premises • E.g. – I love you therefore it follows that you love me. – She is the most beautiful student in this University ergo she should be given a scholarship. – He goes to Church everyday ergo it is impossible for him to do corruption. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 219
Ignoratio elenchi • Ignorance of the proof – Irrelevant conclusion – Missing the point • Draws a conclusion that misses the point entirely • E.g. – Crimes of theft and robbery have been increasing at an alarming rate lately. The conclusion is obvious: we must reinstate the death penalty immediately. – The man is currently suffering from amnesia and has no recollection whatever of the event of the past two weeks. We can only conclude that he did not commit the crime of murdering his neighbor, as he has been accused of doing. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 220
Contradictory Premise • Premises contradict each other • E.g. – If God can do anything, can He make a stone so heavy that He won't be able to lift it? But if He can do anything, He can lift the stone. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 221
Genetic • Taking the origin as evidence • E.g. – Ferdinand Marcos Jr. was raised by his Father who declared Martial Law. It is clear that upon winning the Presidential election, Ferdinand Marcos Jr. will also declare Martial Law. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 222
False Dilemma • 1 of the 2 claims was proven false. Therefore, the other is doubtless true. • Jejomar Binay and Mar Roxas are both running for Presidency. Jejomar Binay was accused of corruption. Therefore we should vote for Mar Roxas for President. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 223
Petitio principii • Begging the question – Circular argument • The premise of the argument is simply a reinstatement of the conclusion • E.g. – Birds know how to fly because they have wings and wings can make them fly. – Philosophers are highly intelligent individuals because if they were not highly intelligent they would not be philosophers. – The Bible asserts that God exists. The Bible is the divine word of God. Therefore, God exists. – "Why are you here?" "Because I'm not there.“ – Declarative sentence is the sentence that declares. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 224
Complex question • A question is asked in such a way as to presuppose the truth of some assumption buried in that question • 1 Question (Actually 2 questions) = 1 Answer • E.g. – Have you stopped cheating on your girlfriend? – Do you still cheat on exams? – Is this the knife you used to kill the victim? – Where did you hide the money you stole? – What did you use to wipe your fingerprints from the gun? 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 225
False analogy • The analogy is not strong enough to support the conclusion that is drawn • The assumption is that if two or more things are alike in some respects, they are alike in some other respect • Analogy or resemblance is not sufficient to warrant the conclusion • E.g. – Bobby’s new car is bright blue, has leather upholstery, and is expensive. Crowley’s new car is also bright blue and has leather upholstery. Therefore, it is also expensive. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 226
Hypothesis Contrary to Fact • Hypothesis that is not true and then draw any supportable conclusions from it • E.g. – If Madame Curie had not happened to leave a photographic plate in a drawer with a chunk of pitchblende, the world today would not know about radium. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 227
Slippery slope • Claims that a certain event will set off a chain reaction, leading in the end to some undesirable consequence, yet there is no sufficient reason to think that the chain reaction will actually take place • E.g. – Attempts to outlaw pornography threaten basic civil rights and should be summarily abandoned. If pornography is outlawed, censorship of newspapers and news magazines is only a short step away. After that there will be censorship of textbooks, political speeches, and the content of lectures delivered by university professors. Complete mind control by the central government will be the inevitable result. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 228
Slippery slope • Claims that a certain event will set off a chain reaction, leading in the end to some undesirable consequence, yet there is no sufficient reason to think that the chain reaction will actually take place • E.g. – Studying philosophy is a dangerous thing to do. It makes you critical., which in turn makes you skeptical of your religious beliefs. And once you have begun to lose faith in your religion, it is a small step to atheism and immorality, and a life of immorality is damned. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 229
Red herring • The arguer diverts the attention of the reader or listener by addressing a number of extraneous issues and ends by presuming that some conclusion has been established • The fallacy got its name from the practice of using a herring, a particularly smelly fish when cooked, to divert hunting dogs from the scent of a fox • Directing attention away from the issue to other seemingly related issues • E.g. – Friends and neighbors I urge you to defeat the proposal to make jail sentences mandatory for drunk drivers. My opponent claims that it will reduce the number of accidents caused by drunk drivers. But if we really want to reduce traffic accidents, then we should stand behind those men and women whose chief responsibility is our safety. I am referring of course, to our valiant police officers, what we need to do is increase their salaries, beef up the police force, and, most importantly, stop butting into their business with troublesome people. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 230
Red herring • E.g. – I agree with my opponent that pornography is a national problem, and I am almost persuaded by his argument that women are being degraded and victimized by pornography. I say, almost persuaded... until I remember the facts that my opponent obviously overlooks: namely, that the people of South Africa are not merely degraded and victimized, they are deprived of every right due a human being. And what I do not understand is how we convince ourselves that our so called national problem takes precedence over genuine oppression and suffering.02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 231 • The arguer diverts the attention of the reader or listener by addressing a number of extraneous issues and ends by presuming that some conclusion has been established • The fallacy got its name from the practice of using a herring, a particularly smelly fish when cooked, to divert hunting dogs from the scent of a fox • Directing attention away from the issue to other seemingly related issues
Suppressed evidence • Undermines the premises of a good argument, causing it to be unsound • Passing off what are at best half-truths as if they were the whole truth thus making a defective argument appears to be good • E.g. – The second amendment to the constitution states that the right of the people to keep and bear arms shall not be infringed. But a law controlling handguns would infringe on the right to keep and bear arms. Therefore, a law controlling hand guns would be unconstitutional.02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 232
Appeal to Pride • Undermines the premises but the focus of the argument is the personal pride • E.g. – Of course, the painting is beautiful. I painted it myself. – I am beautiful because my mother says so. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 233
Argumentum ex silentio • Argument from Silence – is to express a conclusion that is based on the absence of statements in historical documents – Implying answer based on silence • E.g. – The beheading of captives did not happen yesterday because it was not on the newspaper. – God does not exist because there are no evidence of His existence. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 234
Activity • Topic – Fallacy • Instruction – Identify the particular fallacy committed for each item – Only one item has Good Argument – Write your answer on the space provided 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 235
Symbolic Logic • Symbols and Meanings Copi Notation English Expression Name Meaning ~ Not Negation Not, not the case, false, wrong • + ↑ and Conjunction And, yet, but, however, moreover, nevertheless, still, also, although, both / or v or Disjunction Or, unless, either or Ͻ If or then Conditional or implication If…then…, implies, only if, entails that, provided that, on condition that If and only if Biconditional or equivalence If and only if or is equivalent to 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 236
Ad Majorem Dei Gloriam! 02/10/17 03:00 AM 237 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
10-238 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. Published in the Republic of the Philippines.

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Logic: Critical Thinking and Correct Reasoning

  • 1.
    Prof. Sam Bernales,Jr. 02/10/17 03:00 AM 1 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 2.
    Logic • Logike/ Logia/Logos – Coined by Zeno the Stoic • Analytics – Prior and Posterior – Study – Reason – Discourse – Study of the fundamental principles which govern the true nature of correct reasoning or inferential thinking. 02/10/17 03:00 AM 2 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 3.
    Logic • Science andArt of Critical Thinking and Correct Reasoning • Science – Systematized body of Logical Truths and Principles governing correct thinking • Art – Beautiful and Good reasoning – Power to perform certain actions guided by special knowledge and executed with skill 02/10/17 03:00 AM 3 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 4.
    Logic in Profession •Facilitates in organizing ideas. • Scientists – Scientific Method • Public Speaker – Organization of Idea • Lawyer – Good argument to prove position • Household – Planning and organizing things in house. 02/10/17 03:00 AM 4 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 5.
    Logic in Profession •Activity – How can I apply Logic in my profession? 02/10/17 03:00 AM 5 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 6.
    Mind Teaser • Activity –Abstract Reasoning • Inverse the Triangle by moving only 3 balls 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 6
  • 7.
    Mind Teaser • Activity –Abstract Reasoning • Connect all the spheres in 4 straight uninterupted lines 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 7
  • 8.
    Activity • Abstract Reasoning 02/10/1703:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 8
  • 9.
    Mind Teaser • VerbalReasoning – Question • Mayroong 64 na maleta sa eroplano na nasa himpapawid. Kung nahulog ang isa, ilan na lang ang natira? – Answer • 63 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 9
  • 10.
    Mind Teaser • VerbalReasoning – Question • Paano ipapasok ang elepante sa loob ng refrigerator sa tatlong paraan? – Answer • 1. Buksan ang refrigerator • 2. Ipasok ang elepante • 3. Isara ang refrigerator 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 10
  • 11.
    Mind Teaser • VerbalReasoning – Question • Paano ipapasok and giraffe sa loob ng refrigerator sa apat na paraan? – Answer • 1. Buksan ang refrigerator • 2. Ilabas ang elepante sa refrigerator • 3. Ipasok ang giraffe sa loob ng refrigerator • 4. Isara ang refrigerator 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 11
  • 12.
    Mind Teaser • VerbalReasoning – Question • Kaarawan ng haring leon. Lahat ng hayop naroon pero may nawawalang isa. Anong hayop ito? – Answer • Giraffe, naiwan sa loob ng refrigerator 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 12
  • 13.
    Mind Teaser • VerbalReasoning – Question • Paano makakatawid sa ilog ang isang babae nang hindi kakainin ng mga buwaya? – Answer • Tatawid lang siya kasi nasa kaarawan ng haring leon ang lahat ng hayop 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 13
  • 14.
    Mind Teaser • VerbalReasoning – Question • Habang tumatawid sa ilog ang babae, siya ay namatay. Ano ang dahilan ng kanyang pagkamatay? – Answer • Sa kanya bumagsak yung maleta mula sa eroplano 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 14
  • 15.
    Mind Teaser • VerbalReasoning – Question • How many dwarves are there in the story of Cinderella? – Answer • None. It was Snow White who has seven dwarves. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 15
  • 16.
    Mind Teaser • VerbalReasoning – Question • Which is heavier, 1kg of Gold or 1kg of Feather? – Answer • There is no heavier between the two. Both of them weights 1kg. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 16
  • 17.
    Mind Teaser • VerbalReasoning – Question • Inutusan ka para barilin ang isang target. Ang sabi sayo, kung mata tamaan mo, saka ka babayaran. Tinamaan mo sa noo ang target, pero hindi ka binayaran ng taong nag- utos sayo. Ano ang dahilan bakit di ka binayaran? – Answer • Hindi mo natamaan sa mata ang target. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 17
  • 18.
    Mind Teaser • VerbalReasoning – Question • May isang babae na dumalaw sa isang puntod. Noong tinanong siya kung kaanu-ano niya ang nasa puntod and sagot niya, “Ang nanay niya ang nag- iisang anak ng nanay ko.” Kaano ano nya ang nasa puntod? – Answer • Anak 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 18
  • 19.
    Activity • Verbal Reasoning 02/10/1703:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 19
  • 20.
    Divisions of Logic •Formal (Form) – Rules – Principles • Simple apprehension – Grasp entity or reality • Judgment – Compares two ideas based on relation • Reasoning – Abstraction • Material (Matter) – Substance of reasoning 02/10/17 03:00 AM 20 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 21.
    Exempli Gratia All senatorsare politicians. No senators are congressmen. X Ergo, no congressmen are politicians. Formally Correct Materially Wrong All nurses are health- care professionals. Some nurses are Filipinos. Ergo, some Filipinos are health-care professionals. Formally Correct Materially Correct 02/10/17 03:00 AM 21 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 22.
    Formal Logic • Everycat is an animal • Every tiger is an animal • Ergo, every tiger is cat Formally Wrong Materially Wrong 02/10/17 03:00 AM 22 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 23.
    Formal Logic • Everycat is animal • Every pig is animal • Ergo, every pig is cat. Formally Wrong Materially Wrong 02/10/17 03:00 AM 23 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 24.
    Formal Logic • Everyanimal is four legged substance • Some table is animal • Ergo, every table is four-legged substance. Formally Correct Materially Wrong 02/10/17 03:00 AM 24 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 25.
    Structure of Logic ExternalExpressions/ Significations Mental Operations Term/ Concept Simple Apprehension Proposition Judgment Syllogism/ Fallacy/ Debate Reasoning/ Argument 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 25
  • 26.
    Terms • Terms – Signsof concepts – Instrumental signs – Expression of an idea – Thought – Concept – Mental Proposition – Mental Argumentation 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 26
  • 27.
    Terms according toStructure • Simple – Consist only one word • Skunk • Complex – Consists of a group of words that signify one thing • The black little cat-like animal with the white stripe down its back is a skunk 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 27
  • 28.
    Terms according toEssence • Significant – Signifies the quiddity (whatness) or nature of the thing they stand for • Man, Dog • Non-significant – merely point out things without signifying their quiddities or nature • This, That, Those 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 28
  • 29.
    Terms According toComponents • Simple – Only one feature • Book • Compound – Several features • Human Person 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 29
  • 30.
    Terms According toComprehension • Concrete – Expresses something which has attributes that are capable of being perceived through the senses. • ball, can, desk, stone • Abstract – expresses something as separated from any single object. It denotes the general attributes of many objects. • When I sit next to you, my heart beats definitely faster. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 30
  • 31.
    Terms According toComprehension • Abstractive – Creates a meaning out of own experience • Great experience • Being whole • Happiness • Intuitive – Requires presence of an object • Hot coffee • Warmth of day 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 31
  • 32.
    Terms According toComprehension • Absolute/ Privative – No relation to other idea • God • Relative – Explicit relation to other idea • Teacher and Student • Master and Slave 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 32
  • 33.
    Terms According toComprehension • Complete – Expresses all features • Dog • Incomplete – Expresses only some features • Dog as an animal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 33
  • 34.
    Terms according to Comprehension •Generic – Common feature • Being • Paracetamol • Specific – Distinctive feature • Rational • Biogesic 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 34
  • 35.
    Terms according toExtension • Common – General term • Professor • Individual – One object • Proper Name – Prof. Dumbledore • Particular Circumstance – Head Professor of Hogwarts • Demonstrative Pronoun – This Professor 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 35
  • 36.
    Terms according toExtension • Distributive – Essence of entities singularly • Fish • Ant • Collective – Essence of entities as group • School of Fishes • Colony of Ants 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 36
  • 37.
    Terms according toExtension • Universal – represents not only a class as a whole but also each member of the class • table, chair, stone • Collective – represents a number of things constituting a unit-group or whole • family, choir, band, team • Particular – represents only a part of the universal whether it is definite or indefinite • three kings, few guests • Singular – represents a single object • My father, this book 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 37
  • 38.
    Activity • Topic – Termsaccording to Extension • Instruction – Identify the term according to extension: • Universal • Collective • Particular • Singular 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 38
  • 39.
    Inverse Relationship between Comprehensionand Extension COMPREHENSION (S-U) SUPPOSITION EXTENSION (U-S) INTENSION SUBSTANCE Substance Angel, Mineral, Plant, Brute, Man BODY Corporeal Substance Mineral, Plant, Brute, Man ORGANISM Animate Corporeal Substance Plant, Brute, Man ANIMAL Sentient Animate Corporeal Substance Brute, Man MAN Rational Sentient Animate Corporeal Substance Man 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 39
  • 40.
    Inverse Relationship between Comprehensionand Extension • Comprehension – Supposition – Stands for a definite one of the various things it can stand • Chair – Five letter word – Furniture – Chairman • Extension – Intension – Ascribed meaning • Giving example 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 40
  • 41.
    Activity • Topic – InverseRelationship between Comprehension and Extension • Each number contains a pair of terms. • Identify whether the terms are ordered according to Comprehension or Extension. • Arrange the following according to the order of Extension • Comprehension • Extension 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 41
  • 42.
    Terms according toMeaning • Univocal – Same meaning • Human as Person and Human as Person • Analogous – Related meaning – Depends on application • Falling as motion and Falling as in love • Equivocal – Different meaning • Mouse of computer and Mouse in the hole of the house 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 42
  • 43.
    Activity • Topic – Termsaccording to meaning • Instruction – 1. Classify the italicized term in the following sentences according to meaning. • Univocal • Analogous • Equivocal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 43
  • 44.
    Terms according toPerfection • Precise – Exact manner • Triangle – Right Triangle • Imprecise – Not exact manner • Acute Triangle 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 44
  • 45.
    Terms according toPerfection • Clear – Distinct manner • Man as rational being • Obscure – Vague – Indistinct manner • Man as talking animal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 45
  • 46.
    Terms according toPerfection • Adequate – Man as rational being • Inadequate – Man as being 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 46
  • 47.
    Terms according toOrigin/ Formation • Immediate/ Intuitive – Direct observation of things • Water is liquid • Ice is solid • Mediate/ Abstracted – Matters of Faith • Man derives from ape • God is the beginning of all things 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 47
  • 48.
    Terms according toOrigin/ Formation • Explicit – Directly expressed • “I love you.” • Implicit – Directly implied – Matter of presumption • Kiss, Hug 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 48
  • 49.
    Terms according toOrigin/ Formation • Ideal/ Mental – Mind envisions • Heaven on earth • Classless society • Subjective/ Arbitrary – Personal thinking – Judgment of man • Man came from Adam • Real/ Objective – Factual reality • Woman Lawyer 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 49
  • 50.
    Terms according toRelation • Identical – Same idea • Human Person and Rational being • Equivalent – Not the same formal features • Salt and Sodium Chloride 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 50
  • 51.
    Terms according toRelation • Pertinent – Related to each other • Rationality and Learning • Freedom and Responsibility • Authority and Responsibility • Right and Obligation • Impertinent – Not related to each other • Intellect and Gender • Age and Maturity • Wisdom and Race 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 51
  • 52.
    Terms according toRelation • Similar – Same extension but different comprehension • Coffee and Barako • Writer and Journalist • Compatible – Coexist in a subject • Beauty and Brain • Tall, Dark and Handsome • Reason and Faith • Incompatible – That cannot coexist • Sin and Holiness • Health and Sickness • Wisdom and Foolishness • Division of Incompatible Terms – Contradictory • Extremely opposite – Living and Dead – Hot and Cold – High and Low – Contrary • Opposed in certain order – Rich and Poor – Tall and Short – Privative • Concept and its defect – Sight and blindness – Hearing and deafness – Correlative • Mutual relation – Master and Servant – Husband and Wife – Student and Teacher 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 52
  • 53.
    Terms according toObject • Real/ Concrete – Expresses something that has existential actuality • Chair, Table • Abstract/ Logical – Conceptual device to facilitate learning • Democracy • Arbitrary/ Imaginary – No correspondent reality • Spiderman, Flying Carpet • Metaphorical – Stand for an allied meaning • Lamb of God 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 53
  • 54.
    Activity • Topic – Termsaccording to Comprehension, Relation and Object • Instruction – Identify the term according to comprehension, relation and object: • Compatible or Incompatible • Absolute/ Privative or Relative • Arbitrary or Real • Concrete or Abstract 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 54
  • 55.
    Terms according toQuality • Positive Form, Positive Meaning (+) (+) – Life, Truth, Freedom • Positive Form, Negative Meaning (+) (-) – Happy-go-lucky • Negative Form, Negative Meaning (-) (-) – Illegal, Impolite • Negative Form, Positive Meaning (-) (+) – Immortal, Infinite 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 55
  • 56.
    Activity • Topic – Termsaccording to Quality • Instruction – Classify the following terms according to Quality • (+) (+) – Positive Form, Positive Meaning • (+) (-) – Positive Form, Negative Meaning • (-) (-) – Negative Form, Negative Meaning • (-) (+) – Negative Form, Positive Meaning 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 56
  • 57.
    Predicaments • Substance • Man,Dog, Plant • Accident – Quantity • 50 kg.; 100 pesos; 25 ft. long – Quality • intelligent, red, hot, strong, healthy, beautiful – Relation • father, husband – Action/ Activity • running, walking, dancing, driving – Passion • being killed, was shot, are burned, to be lifted – Time • now, today, at 8 pm, next week, noon, morning – Place • here, in the office, Davao, Manila, in the air – Posture/ Position • lying, standing, sitting – Habit/ Possession • in red gown, covered with lace , dressed, armed 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 57
  • 58.
    Activity • Topic – Predicaments •Instructions • Identify the italicized terms according to its category/ predicaments. • Substance • Quantity • Quality • Relation • Action • Passion • Time • Place • Posture • Habit 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 58
  • 59.
    Predicables • Genus – Speciein a class • E.g. Triangle is a polygon • Specific Difference – Differences of the specie from others • E.g. Triangle is three-sided • Species – complete essence of a thing • E.g. Triangle is a three-sided polygon • Accident – Something that attributes the thing by contingency • E.g. Acute Triangle • Property – Attribute • E.g. Triangle has 25 Degrees on each side 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 59
  • 60.
    Judgment • Judgment – Mentaloperation that pronounces the agreement or disagreement between two ideas – E.g. • Square and Polygon – Square is a Polygon • Table and Chair – Table is not a Chair 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 60
  • 61.
    Proposition • Subject statement –True or False • Logic is the study of the principles of correct reasoning. • Being a president is like riding a tiger. • Charles Dickens wrote Romeo and Juliet. 02/10/17 03:00 AM 61 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 62.
    Proposition • Subject statement –Affirmed or Denied • God exists. • Atlantis uncovered. 02/10/17 03:00 AM 62 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 63.
    Proposition • Subject statement –affirm or deny the attribute of a subject. • A dog is an animal. • A dog is not a cat. 02/10/17 03:00 AM 63 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 64.
    Proposition • Subject statement –affirm or deny the relationships, connections between member propositions. • If it is raining, the ground is probably wet. 02/10/17 03:00 AM 64 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 65.
    Activity • Topic – Proposition •Instruction – 1. Identify which of the following is a Proposition and which is not. – 2. Write P if the statement is proposition and N if it is not. – 3. Write the answer on the blank provided in each sentence. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 65
  • 66.
    Activity • Topic – Proposition •Instruction – Establish whether this proposition is true or false. – Explain • True • False • True and False • I refuse to answer True or False 02/10/17 03:00 AM 66 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 67.
    Types of Proposition •Causal • Modal • Inferential • Simple • Compound • Existential • Non-existential • Categorical • Hypothetical 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 67
  • 68.
    Elements of Proposition •Subject – Something that is being talked about in the Proposition – Something that is denied or affirmed • Copula – Linking verb – Tense • Predicate – Something that talks about the Subject – Affirmed or denied by the Subject 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 68
  • 69.
    Structure of Proposition •Quantifier (Form) – All • Subject (Matter) – students majoring in philosophy • Copula (Form) – are • Predicate (Matter) – required to take Metaphysicsand Epistemology 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 69
  • 70.
    Quantifiers • Universal Quantifier –All ( Affirmative ) – Every ( Affirmative ) – Any ( Affirmative ) – No ( Negative ) – None ( Negative ) • Particular Quantifier – Some – At least one – Most – Almost all – The majority 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 70
  • 71.
    Categorical Proposition • A(Universal-Affirmative) • All S are P – All politicians are honorable men. • I (Particular-Affirmative) • Some S are P – Some politicians are honorable men. • E (Universal-Negative) • All S are not P – All politicians are not honorable men. • O (Particular-Negative) • Some S are not P – Some politicians are not honorable men. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 71 Affirmative Negative Universal A E Particular I O
  • 72.
    Double Negation • Negative+ Negative = Positive • Offset Rule • Bullet and Train Method • E.g. – No man is not mortal by nature. – He who did not vote for Roxas last national election was not convinced of his leadership. • E.g. – No dogs that are without pedigrees are candidates for the blue ribbon in official dog shows. – Not all ordained ministers are not holy. – Nothing that is material is indestructible. – Most sins are not unforgivable. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 72
  • 73.
    Modal Propositions • (A)Necessary Mode – An absolute being must exist. – It is necessary for cats to purr. • (E) Impossible Mode – Angels cannot be mortals. – It is impossible for squares to be circulars. • (I) Possible Mode – This car can run 300 mph. – It is possible for believer to become saints. • (O) Unnecessary Mode – It is not necessary for God to be creator just to become God. – It is contingent for tables to have four legs. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 73
  • 74.
    Quality of Proposition •Not all – Particular Negative • Last but not the least – Affirmative 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 74
  • 75.
    Hypothetical Proposition • DisjunctiveProposition – Either-or (+) (-) • The will is either free or determined. • Conjunctive Proposition – All cannot be true (-) (-) • You cannot work and play at the same time. • Conditional Proposition – If-then (+) (+) • If a man works, then he deserves the reward of his labor. • Biconditional Proposition – If and only if (+) (+) • You will pass this course if and only if you will study hard. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 75
  • 76.
    Activity • Topic – HypotheticalProposition • Instruction – 1. State the correct hypothetical proposition. • Conditional • Biconditional • Conjunctive • Disjunctive 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 76
  • 77.
    Activity • Topic – CategoricalProposition I • Instruction – 1. Classify the following Proposition according to quantity, quality and symbol. • Quantity – Universal – Particular • Quality – Affirmative – Negative • Symbol – A – I – E – O 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 77
  • 78.
    Activity • Topic – CategoricalProposition II • Instruction – 1. Give the correct symbol of the following categorical proposition. • A • I • E • O 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 78
  • 79.
    Inference • Inference – Theconclusion is reached – Meanings are already implied in the former • Non-inference – The conclusion is not reached • From the given premise: – The birds are flying south. – She graduated summa cum laude. – Lights are out and their car is gone. – The cat is standing by her dish meowing. • Infer the conclusion: – I suspect they are not home. – She is probably hungry. – Winter must be coming. – She must have studied hard in college. 02/10/17 03:00 AM 79 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 80.
    Types of Inference •Immediate – Draws conclusion from any proposition • Opposition • Logical Proposition • Eduction – Interchanging the subject and predicate – Putting or removal of negatives • Mediate – Draws conclusion from series of proposition • Categorical Syllogism 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 80
  • 81.
    Square of Opposites EveryS is P No S is P Some S is P Some S is not P 02/10/17 03:00 AM 81 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. • Contrariety – Contraries • Contradiction – Contradictories • Subalternation – Subalterns • Subcontrariety – Subcontraries
  • 82.
    Laws of Contradiction •Rule: – If A is true, O is false. – If E is true, I is false. – If A is false, O is true. – If E is false, I is true. – If O is true, A is false. – If I is true, E is false. – If O is false, A is true. – If I is false, E is true. – A - All dogs are animals. – O - Some dogs are not animals. – E - No women are married. – I - Some women are married. – O - Some prisoners are not guilty. – A - All prisoners are guilty. – I - Some apples are oranges – E - No apples are oranges. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 82
  • 83.
    Laws of Contrariety •Rule: – If A is true, E is false. – If A is false, E is doubtful. – If E is true, A is false. – If E is false, A is doubtful. – A - All cats are animals. True – E - No cats are animals. False – E - No cats are dogs. True – A - All cats are dogs. False – A - All flowers are roses. False – E - No flowers are roses. False – E - No Catholic priests are ordained. False – A - All Catholic priests are ordained. True 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 83
  • 84.
    Laws of Subcontrariety •Rule: – If I is false, O is true. – If I is true, O is doubtful. – If O is false, I is true. – If O is true, I is doubtful. – I - Some triangles are squares. False – O - Some triangles are not squares. True – O- Some students are not present. False – I - Some students are present. True – I - Some basketball players are tall. True – O - Some basketball players are not tall. True – O - Some scholars are not dumb. True – I - Some scholars are dumb. False 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 84
  • 85.
    Laws of Subalternation •Rule 1: – If A is true, I is true. – If E is true, O is true. – If A is false, I is doubtful. – If E is false, O is doubtful. – A - All surgeons are doctors. True – I - Some surgeons are doctors. True – E - No beauty titlist is ugly. True – O - Some beauty titlists are not ugly. True – A - All students are scholars. False – I - Some students are scholars. True – E - No dogs are animals. False – O- Some dogs are not animals. False 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 85
  • 86.
    Laws of Subalternation •Rule 2: – If I is false, A is false. – If O is false, E is false. – If I is true, A is doubtful. – If O is true, E is doubtful. – I - Some devils are good. False – A - All devils are good. False – O - Some angels are not spiritual. False – E - No angels are spiritual. False – I - Some oranges are fruits. True – A - All oranges are fruits. True – O - Some athletes are not swimmers. True – E - No athletes are swimmers. False 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 86
  • 87.
    Chart – Oppositionof Proposition A E I O A True T F T F E True F T F T I True D F T D O True F D D T A False F D D T E False D F T D I False F T F T O False T F T F 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 87
  • 88.
    Activity • Topic – Squareof Opposition • Instruction – Determine whether the following inferences are correct or incorrect – From the truth or falsity of the given statement, determine the symbol, judgment and relationship of the following statements – Indicate “The same proposition” if the relationship came from the same symbol and the same judgment – Encircle the symbol and judgment and write the relationship • Precision – Correct – Incorrect • Symbol – A – I – E – O • Judgment – True – False – Doubtful • Relationship – Contradiction – Contrariety – Subcontrariety – Subalternation 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 88
  • 89.
    Eduction • Conversion – SwitchS and P Symbol Statement Converse Truth Value E No S are P No P are S Same I Some S are P Some P are S A All S are P All P are S Undetermined O Some S are not P Some P are not S 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 89
  • 90.
    Eduction • Obversion – Changethe Quality – Negate P Symbol Statement Obverse Truth Value A All S are P No S are non P Same E No S are P All S are non P I Some S are P Some S are non P O Some S are not P Some S are not non P 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 90
  • 91.
    Eduction • Contraposition – Switchand Negate S and P Symbol Statement Contrapositive Truth Value A All S are P All non P are non S Same O Some S are not P Some non P are not non S E No S are P No non P are non S Undetermined I Some S are P Some non P are non S 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 91
  • 92.
    Eduction • Inversion 1 –Change the Quantity from Universal to Particular – Particular Quantity cannot be inversed – Change the Quality of Subject and Predicate Symbol Statement Inverse Truth Value A Every S is P Some non S is non P Same E Every S is not P Some non S is P I Cannot be inversed O 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 92
  • 93.
    Eduction • Inversion 2 –Change the Quantity from Universal to Particular – Particular Quantity cannot be inversed – Change the Quality of Subject and Predicate Symbol Statement Inverse Truth Value A Every S is P Some non S is non P Same E Every S is not P Some non S is not non P I Cannot be inversed O 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 93
  • 94.
    Activity • Topic – EductionI • Instruction – 1. Identify the correct Eduction of the following proposition – 2. Write the letter of your choice on the space provided 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 94
  • 95.
    Activity • Topic – EductionII • Instruction – State the correct Eduction of the following proposition – Double Negation does not apply – Simplifying “Not all” to “Some” does not apply 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 95
  • 96.
    Argument • Group ofProposition in which the Premises result in Conclusion. • Premise 1 – Anything that moves is moved by another; • Premise 2 – But, the ball moves; • Conclusion – Ergo, the ball is moved by another. 02/10/17 03:00 AM 96 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 97.
    Structure of Argument •Premise 1 – Anything that moves is moved by another; • Given Proposition • Premise 2 – But, the ball moves; • reason of the conclusion • serves as the evidence • Conclusion – Ergo, the ball is moved by another. • Offshoot • Claim being made • followed the evidence 02/10/17 03:00 AM 97 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 98.
    Not arguments • Raisinsare dried grapes. Prunes are dried plums. • These are some of the symptoms of neurosis: strong guilt feeling, irrational fears, insomnia, and inability to make decisions. • It is sunny today. It is also the beginning of the week. 02/10/17 03:00 AM 98 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 99.
    Good Argument • Conclusionis a result of Premise • Premise – It had rained yesterday, • Conclusion – Some places have been flooded. 02/10/17 03:00 AM 99 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 100.
    Bad Argument • Conclusionis not a result of Premise • Premise – Identical twins who inherit the same genes have different intelligence quotient. • Conclusion – Environment must have played a role in determining intelligence. 02/10/17 03:00 AM 100 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 101.
    Premise Indicators • since •because • for • as • follows from • as shown by • In as much as • as indicated by • the reason is that • may be inferred from • may be derived from • may be deduced from • in view of the fact that • in that • seeing that • given that • may be concluded from • on the reason that • due to the fact that • based on the premise that 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 101
  • 102.
    Conclusion Indicators • therefore •hence • thus • so • wherefore, • accordingly, • in consequence • consequently • proves that • as a result • for this reason • it follows that • we may infer • I conclude that • which shows that • which means that • which entails that • which implies that • which allows us to infer • which points to the conclusion that • it must be that 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 102
  • 103.
    Activity • Topic – Premiseand Conclusion • Instruction – 1. Identify the premise and the conclusion in the following propositions – 2. Indicate the indicator of the respective premise and/ or conclusion – 3. Underline the Premise and Conclusion – 4. Write P above the Premise and C above the Conclusion – 5. Encircle the Indicator 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 103
  • 104.
    Premise precedes Conclusione. g. • Premise – The investigation of supernatural phenomena lies outside the realm of science. • Conclusion – Ergo, science can neither prove nor disprove the existence of God. 02/10/17 03:00 AM 104 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 105.
    Premise precedes Conclusione. g. • Premise – Because many are rightly concerned about the troublesome state of affairs that currently exists between Christian and Moslem in Egypt. • Conclusion – It is understandable to look to the legal system for help in addressing the problem. 02/10/17 03:00 AM 105 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 106.
    Premise precedes Conclusione. g. • Premise – Wisdom is the principal thing; • Conclusion – Ergo, seek the pursuit of wisdom. 02/10/17 03:00 AM 106 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 107.
    Premise precedes Conclusion •shows that • indicates that • proves that • entails that • implies that • establishes that • Activity – Make propositions using these indicators. 02/10/17 03:00 AM 107 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 108.
    Conclusion precedes Premisee. g. • Conclusion – The Food and Drug Administration should stop all cigarette sales immediately. • Premise – After all, cigarette smoking is the leading preventable cause of death. 02/10/17 03:00 AM 108 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 109.
    Conclusion precedes Premisee. g. • Conclusion – Moreover, cutting SSS will not improve the deficit problem. As the Secretary of Department of Budget has noted, • Premise – Social security is funded by separate payroll taxes and contributes not a peso to the deficit. 02/10/17 03:00 AM 109 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 110.
    Conclusion precedes Premise •Activity – Make propositions using these indicators. • is shown by • is indicated by • is proven by • is entailed by • is implied by • is established by 02/10/17 03:00 AM 110 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 111.
    Activity • Topic – Premiseprecedes Conclusion and Conclusion precedes premise • Instruction – 1. Write N if it is not an argument. – 2. If it is an argument, write PC if the Premise precedes Conclusion. – 3. Write CP if the Conclusion precedes Premise 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 111
  • 112.
    Statement to Argument •The president, being human, is mortal, as all human beings are mortal. • Premise 1 – All human beings are mortals. • Premise 2 – The president is a human being. • Conclusion – Ergo, the president is mortal. 02/10/17 03:00 AM 112 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 113.
    Statement to Argument •God does not exist because if he did there would be no suffering and evil in the world; but obviously suffering and evil do exist. Thus, there is no God. • Premise 1 – If God existed there would be no suffering and evil in the world. • Premise 2 – But obviously suffering and evil do exist. • Conclusion – Ergo, there is no God. 02/10/17 03:00 AM 113 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 114.
    Statement to Argument •All mammals feed their young with milk. All humans are mammals. Ergo, all humans feed their young with milk. • Activity – Transform the statement into an argument. 02/10/17 03:00 AM 114 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 115.
    Statement to Argument •All that feed their young with milk are mammals. All humans feed their young with milk. Ergo, all humans are mammals. • Activity – Transform the statement into an argument. 02/10/17 03:00 AM 115 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 116.
    Reasoning • Reasoning – Mentaloperation in which propositions are compared into order to create a meaningful conclusion. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 116
  • 117.
    Validity of Reasoning •Rules: – The conclusion should flow from the material content of the premise – An argument containing true premises cannot have a false conclusion • Valid E.g. – All sharks are ferocious animals. – However, some sea creatures are sharks. – Ergo, some sea creatures are ferocious animals. • Invalid E.g. – All stars are heavenly bodies. – However, Angelina Jolie is a star. – Ergo, Angelina Jolie is a heavenly body. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 117
  • 118.
    Activity • Topic – Validityof Reasoning • Instruction – Identify whether the argument is Valid or Invalid 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 118
  • 119.
    Types of Reasoning •Deduction – From General to Specific – Determines whether the argument is Valid of Invalid – Core of Aristotelian Logic – E.g. • All businessmen are millionaires • However, some businessmen are Filipinos • Ergo, some Filipinos are millionaires. • Induction – From Specific to General – Philosophy of Francis Bacon and John Stuart Mill – Determines whether the argument is correct or incorrect. – E.g. • Juan is a Filipino • Juan is a hardworking man. • Ergo, probably all hardworking men are Filipinos. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 119
  • 120.
    Kinds of Reasoning •Deductive – Conclusion follows necessarily from premise. – Premise supports conclusion because it is true. – Because it is impossible for the conclusion to be false. • Inductive – Conclusion follows probably from premise. – Premise supports conclusion because of it is assumedly true. – Because it is probable for the conclusion to be true. 02/10/17 03:00 AM 120 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 121.
    Deductive • Indicators – Necessarily –Certainly – Absolutely – Definitely • E.g. – If a substance is a noble gas, it is inert. Therefore, since argon is a noble gas, it necessarily follows that it is inert. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 121
  • 122.
    Inductive • Indicators – Probable –Improbable – Plausible – Implausible – Likely – Unlikely • E.g. – Neon has unstable isotopes. Therefore, since argon is similar in many ways to neon, it probably follows that argon has unstable isotopes, too. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 122
  • 123.
    Deductive vs. Inductive •Deductive – Premise 1 • All saleswomen are extroverts. – Premise 2 • Judy Wage is a saleswoman. – Conclusion • Therefore, she is extrovert. • Inductive – Premise 1 • The vast majority of saleswomen are extroverts. – Premise 2 • Rose Liam is a saleswoman. – Conclusion • Therefore, she is extrovert. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 123
  • 124.
    Deductive and Inductive •Arguments with no indicator – Depends on the Matter 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 124
  • 125.
    Forms of DeductiveReasoning • Argument based on mathematics – An argument in which the conclusion depends on some purely arithmetic or geometric computation or measurement. • E.g. – A shopper may place two apples and three oranges into a paper bag and then conclude that the bag contains five fruits. – A surveyor might measure a square piece of land and, after determining that it is 100 feet on each side, conclude that it contains 10,000 square feet. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 125
  • 126.
    Forms of DeductiveReasoning • Argument from definition – An argument in which the conclusion is claimed to depend upon the definition of some word or phrase used in the premise or the conclusion • E.g. – Claudia is mendacious, so she tells lies. – This paragraph is prolix, so it follows that it is excessively wordy. • Dictionary: – Mendacious • Liar – Prolix • Prolonged 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 126
  • 127.
    Forms of DeductiveReasoning • Categorical syllogism – A syllogism in which each statement begins with one of these quantifiers: • All • No • E.g. – Premise 1 • All lasers are optical devices. – Premise 2 • Some lasers are surgical instruments. – Conclusion • Therefore, some optical devices are surgical instruments. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 127
  • 128.
    Forms of DeductiveReasoning • Conditional syllogism – A syllogism having a conditional statement for one or both of its premises. • E.g. – Premise 1 • If quartz scratches glass, then quartz is harder than glass. – Premise 2 • Quartz scratches glass. – Conclusion • Therefore, quartz is harder than glass. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 128
  • 129.
    Forms of DeductiveReasoning • Disjunctive syllogism – A syllogism having a disjunctive statement (“either...or”) for one or both of its premises. • E.g. – Premise 1 • Either breach of contract is a crime or it is not punishable by the state. – Premise 2 • Breach of contract is not a crime. – Conclusion • Therefore, it is not punishable by the state. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 129
  • 130.
    Forms of InductiveReasoning • Prediction – The premises deal with some known event in the present or past, and the conclusion moves beyond this event to some event in the relative future. • E.g. – Because certain meteorological phenomena have been observed to develop over a certain region in the Pacific, a storm will occur there in the next several hours. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 130
  • 131.
    Forms of InductiveReasoning • Argument from analogy – An argument that depends on the analogy between two things. • E.g. – From knowledge that his Mercedes car is an expensive car, I argue that your car, being a Mercedes, is also expensive. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 131
  • 132.
    Forms of InductiveReasoning • Inductive generalization – An argument that proceeds from the knowledge of a selected sample to some claim about the whole group. Because the members of the sample have a certain characteristic, it is argued that all the members of the group have the same characteristic. • E.g. – One may argue that because three oranges selected from a certain crate were especially tasty and juicy, all the oranges from that crate are especially tasty and juicy. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 132
  • 133.
    Forms of InductiveReasoning • Argument from authority – An argument in which the conclusion rests upon a statement made by some presumed authority or witness. • E.g. – A lawyer may argue that the suspect committed no murder because an eyewitness testified to that effect under oath. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 133
  • 134.
    Forms of InductiveReasoning • Argument based on signs – An argument that proceeds from the knowledge of a certain sign. • E.g. – When driving on an unfamiliar highway, one might see a sign indicating that the road makes several sharp turns one mile ahead. Based on this information, one might argue that the road does indeed make several sharp turns one mile ahead. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 134
  • 135.
    Forms of InductiveReasoning • Causal inference – An argument that proceeds from the knowledge of a cause to knowledge of the effect – An argument that proceeds from the knowledge of an effect to knowledge of a cause. • E.g. Cause to effect – From the knowledge that a bottle of wine had been accidentally left in the freezer overnight, someone might conclude that it had frozen. • E.g. Effect to Cause – after tasting a piece of chicken and finding it dry and crunchy, one might conclude that it had been overcooked. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 135
  • 136.
    Activity • Topic – Kindsof Reasoning • Instruction – 1. Identify whether the argument is Deductive or Inductive – 2. Indicate the form of the respective argument – 3. Write the answer on the blank provided in each sentence. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 136
  • 137.
    Syllogism • Syllogism – DeductiveArgument – Composed of three proposition • Major Premise – Consist of Predicate Term of the Conclusion and a Middle Term – Usually begin with Universal quantifier • Minor Premise – Consist of Subject Term of the Conclusion and a middle term • Conclusion – Composed of: » Predicate of the Major premise » Subject of the Minor Premise 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 137
  • 138.
    Perfect Syllogism • Categorical –Simple – Compound • Hypothetical – Conditional – Conjunctive – Disjunctive 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 138
  • 139.
    Components of Syllogism •Major Premise – All men are mortal. (M) (T) • Minor Premise – All Filipinos are men. (t) (M) • Conclusion – Ergo, all Filipinos are (t) mortal. (T) • Major Term (T) – Predicate of the Conclusion – Occurrence: Conclusion and One of the Premise • Minor Term (t) – Subject of the Conclusion – Occurrence: Conclusion and in the Premise where the Major Term does not occur • Middle Term (M) – Unites the Major and Minor Term – Does not occur in the Conclusion – Occurrence: Major and Minor Premise 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 139
  • 140.
    Steps in CategoricalSyllogism • Major Premise – All men are mortal. (M) (T) • Minor Premise – All Filipinos are men. (t) (M) • Conclusion – Ergo, all Filipinos are (t) mortal. (T) • 1. Look for Conclusion • 2. Predicate in Conclusion – Major Term (T) • 3. Subject in Conclusion – Minor Term (t) • 4. Premise with the Major Term (T) – Major Premise • 5. Premise with the Minor Term (t) – Minor Premise • 6. Common Term in the Major Premise and Minor Premise – Middle Term (M) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 140
  • 141.
    Activity • Topic – CategoricalSyllogism Steps • Instruction – 1. Identify the Major Premise, Minor Premise and Conclusion. – 2. Underline and identify the Major Term (T), Minor Term (t) and Middle Term (M) using the proper symbols following the Steps in Categorical Syllogism. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 141
  • 142.
    Rules of CategoricalSyllogism • Rule No. 1 – There must be only three categorical proposition • All golds are metals. • All jewelries are golds. • Ergo, all jewelries are metals. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 142
  • 143.
    Rules of CategoricalSyllogism • Rule No. 2 – There must be only three univocal terms, each of which occurs twice but not in the same proposition • All flowers are beautiful. (M) (T) • Tulip is a flower. (t) (M) • Tulip is beautiful. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 143
  • 144.
    Rules of CategoricalSyllogism • Rule No. 3 – The middle term must be distributed (Universal) at least once • All trees are plants. (M) (T) • All Bonsai are trees. (t) (M) • Ergo, all Bonsai are plants. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 144
  • 145.
    Rules of CategoricalSyllogism • Rule No. 4 – If the term is distributed (Universal) in the conclusion, then such term must be distributed (Universal) in a premise • Major and Minor terms must not be universal in the conclusion if they are not universal in the premises. • Some metals are cars. (M) (T) • All robots are metals. (t) (M) • Ergo, all robots are cars. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 145
  • 146.
    Rules of CategoricalSyllogism • Rule No. 5 – There must be no two particular premises; one premise must be universal • Some metals are gold. (M) (T) • All rings are metals. (t) (M) • Ergo, all rings are gold. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 146
  • 147.
    Rules of CategoricalSyllogism • Rule No. 6 – If one premise is particular, the conclusion must be particular • Some stones are pearl. (M) (T) • All crowns are stones. (t) (M) • Ergo, some crowns are pearl. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 147
  • 148.
    Rules of CategoricalSyllogism • Rule No. 7 – If the conclusion is negative, only one premise must be negative • All stars are cute. (T) (M) • Some comedians are not cute. (t) (M) • Ergo, some comedians are not stars. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 148
  • 149.
    Rules of CategoricalSyllogism • Rule No. 8 – If the conclusion is affirmative then both premises must be affirmative • All legislators are senators. (t) (M) • All senators are honest. (M) (T) • Ergo, all legislators are honest. (t) (T) 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 149
  • 150.
    Activity • Topic – CategoricalSyllogism Rules • Instruction – 1. Identify the Rule Violated in the following Categorical Syllogism – 2. Write the rule statement beside the given Syllogism. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 150
  • 151.
    Figures of CategoricalSyllogism 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 151 Figure 1 Figure 2 M P S M S P P M S M S P Figure 3 Figure 4 M P M S S P P M M S S P
  • 152.
    Moods of CategoricalSyllogism • Valid Moods of Figure 1 – AAA Barbara – AII Darii – EAE Celarent – EIO Ferio • Valid Moods of Figure 2 – AOO Baroco – AEE Camestres – EAE Cesare – EIO Festino 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 152
  • 153.
    Moods of CategoricalSyllogism • Valid Moods of Figure 3 – AAI Darapti – AII Datisi – EAO Felapton – EIO Ferison – IAI Disamis – OAO Bocardo • Valid Moods of Figure 4 – AAI Bramantip – AEE Camenes – EAO Fesapo – EIO Fresison – IAI Dimaris 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 153
  • 154.
    Activity • Topic – CategoricalSyllogism - Figures and Moods • Instruction – 1. Determine the Figures and Moods of the following Categorical Syllogism – 2. Write your answer of the space provided 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 154
  • 155.
    Hypothetical Syllogism • HypotheticalSyllogism – Contains major premise that is hypothetical proposition – Forms: • Conditional Syllogism • Conjunctive Syllogism • Disjunctive Syllogism • E.g. – If penguins are birds then they have feathers and wings. – However, penguins are birds. – Ergo, they have feathers and wings. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 155
  • 156.
    Conditional Syllogism • ConditionalSyllogism – Have conditional major premise – Indicators: • If then – Modus Ponens • Posit the antecedent and the consequent – Structure • S P • S • P • E.g. Valid – If you are beautiful then you have many admirers. – However, you are beautiful – Ergo, you have many admirers. • E.g. Invalid – If you are beautiful then you have many admirers. – However, you have many admirers. – Ergo, you are beautiful. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 156
  • 157.
    Conditional Syllogism • ConditionalSyllogism – Have conditional major premise – Indicators: • If then – Modus Tollens • Sublate the consequent and antecedent – Structure • S P • P • S • E.g. Valid – If you are an athlete then you are energetic. – However, you are not energetic. – Ergo, you are not an athlete. • E.g. Invalid – If you are an athlete then you are energetic. – However, you are not an athlete. – Ergo, you are not energetic. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 157
  • 158.
    Activity • Topic – ConditionalSyllogism • Instruction – Identify whether the argument is a valid Modus Ponens or Modus Tollens 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 158
  • 159.
    Conjunctive Syllogism • ConjunctiveSyllogism – Indicator: • And – Ponendo-Tollens • Posit one term of the major premise in the minor premise • Sublate one term of the major premise in the conclusion – Structure • Positive Minor Premise • Negative Conclusion • E.g. Valid – You cannot be a manager and a janitor at the same time – However, you are a manager. – Ergo, you are not a janitor. • E.g. Invalid – You cannot be a manager and a janitor at the same time – However, you are not a manager. – Ergo, you are a janitor. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 159
  • 160.
    Activity • Topic – ConjunctiveSyllogism • Instruction – Identify whether the argument is Valid or Invalid 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 160
  • 161.
    Disjunctive Syllogism • DisjunctiveSyllogism – Indicators: • Either or – Ponendo-Tollens • Minor premise posits a member of major premise • Conclusion must Sublate the other remaining member – Structure • Major Premise cannot be both true in Minor Premise and Conclusion • Positive Minor premise • Negative Conclusion • E.g. Valid – Man is either biped or quadruped. – However, man is biped. – Ergo, man is not quadruped. • E.g. Invalid – Man is either biped or quadruped. – However, man is biped. – Ergo, man is quadruped. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 161
  • 162.
    Activity • Topic – DisjunctiveSyllogism • Instruction – Identify whether the argument is Valid or Invalid 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 162
  • 163.
    Imperfect Syllogism • Polysyllogism –Enthymeme • First Order • Second Order • Third Order – Sorites • Aristotelian • Goclenian – Dilemma • Simple • Complex – Epichireme • Explained with: – Because – Since – Insofar – In as much02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 163
  • 164.
    Enthymeme • First Order –Major Premise is omitted • Second Order – Minor Premise is omitted • Third Order – Conclusion is omitted • E.g. – Given: • Every artist is imaginative. • However, Picasso is an artist. • Ergo, he is imaginative. – First Order • Picasso is an artist. • Ergo, he is imaginative. – Second Order • Every artist is imaginative. • Ergo, Picasso is imaginative. – Third Order • Every artist is imaginative. • Picasso is an artist. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 164
  • 165.
    Activity • Topic – Enthymeme •Instruction – Fill the three orders of Enthymeme 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 165
  • 166.
    Sorites • Aristotelian Sorites –Predicate of the Premise is the Subject of the Series of Conclusion excluding Final Conclusion – Final Conclusion is composed of: • Subject of the First Premise • Predicate of the Last Conclusion • Goclenian Sorites – Reverse of Aristotelian Sorites – Subject of the Premise is the Predicate of the Series of Conclusion excluding Final Conclusion – Final Conclusion is composed of: • Subject of the Last Conclusion • Predicate of the First Premise • E.g. Aristotelian Sorites – Philippines is an archipelago. – An archipelago is a land surrounded by water. – A land surrounded by water is an island. – An island is a mass of land. – A mass of land is not an ocean. – Ergo, Philippines is not an ocean. • E.g. Goclenian Sorites – A mass of land is not an ocean. – An island is a mass of land. – A land surrounded by water is an island. – An archipelago is a land surrounded by water. – Philippines is an archipelago. – Ergo, Philippines is not an ocean. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 166
  • 167.
    Activity • Topic – Sorites •Instruction – Identify whether the syllogism is Aristotelian Sorites or Goclenian Sorites 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 167
  • 168.
    Fallacy Illicit Process •Fallacy Illicit Process – Violates the rules of distribution – Term appears to be Universal or Particular in the Conclusion, but not in the Premise – Positive Proposition makes Particular Predicate – Negative Proposition makes Universal Predicate • Fallacy Illicit Major • Fallacy Illicit Minor • Fallacy of Undistributed/ Particular Middle 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 168
  • 169.
    Fallacy Illicit Major •Fallacy Illicit Major – Violates the rules of distribution – Major Term appears to be Universal or Particular in the Conclusion, but not in the Major Premise – Positive Proposition makes Particular Predicate – Negative Proposition makes Universal Predicate • E.g. – All dogs are mammals. • Middle Universal + Major Particular – No cats are dogs. • Minor Universal - Middle Universal – Ergo, no cats are mammals. • Minor Universal - Major Universal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 169
  • 170.
    Fallacy Illicit Minor •Fallacy Illicit Minor – Violates the rules of distribution – Minor Term appears to be Universal or Particular in the Conclusion, but not in the Minor Premise – Positive Proposition makes Particular Predicate – Negative Proposition makes Universal Predicate • E.g. – All cats are felines. • Middle Universal + Major Particular – All cats are mammals. • Middle Universal + Minor Particular – Ergo, all mammals are felines. • Minor Universal + Major Particular 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 170
  • 171.
    Fallacy of UndistributedMiddle • Fallacy of Undistributed/ Particular Middle – Violates the rules of distribution – Only one Middle Term must be Particular – Positive Proposition makes Particular Predicate – Negative Proposition makes Universal Predicate • E.g. – All mammals are animals. • Major Universal + Middle Particular – Some animals are brute. • Middle Particular + Minor Particular – Ergo, not all brute are mammals. • Minor Particular - Major Universal 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 171
  • 172.
    Debate • Structure ofDebate – Constructive Speech • Affirmative first contender – Interpellation – Question » Destroy – Answer » Defend 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 172
  • 173.
    Debate• Types ofDebate – Lincoln-Douglas/ Two men debate • 1 Affirmative and 1 Negative – Rebuttal • 3 Members per side • All members can rebut the speaking opponent except the 1st affirmative who will close the debate – Parliamentary/ Oregon-Oxford • 3 Speakers • 1st speaker affirmative starts the debate and be interprellated by the 1st Speaker negative. • 1st speaker negative starts and be interprellated by 2nd speaker affirmative and so on. • 1st speaker affirmative will interprellate the last negative speaker and will close the debate. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 173
  • 174.
    Debate– Valid Objections •Objection Your Honor/ Mr. Moderator, the question is: – Irrelevant/ Misleading/ Beyond the scope of the topic » Question is nothing to do with the topic » Purposely throwing off track the topic – Vague and Kilometric » Question could not be understood – Immaterial/ Has no basis/ Hearsay » Doubtful evidence – Hypothetical » Based on assumptions – Calling for Opinion » Speculation » Personal » Beyond expertise – Calling for two extremes » Misleading choices – Argumentative » Cannot be proven – Badgering » Shouting » No room for answer – Leading » Complex Question – Repulsive to the Senses » Pictures of dead, garbage, etc. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 174
  • 175.
    Debate – Qualifications • YourHonor/ Mr. Moderator – May I qualify my answer? The question is complex. – Questions • Structured – Series of deductions • Single – Seeking evidence that opponent does not have • Straw – Rapid Fire » Rattles and Pressure the other side • Rebuttal Speech • Team Captain of both sides – Fallacies • Accidents • False Cause • Consequent • Complex Question • Begging the Question • Absolute • Ad Hominem • Ad Populum • Misericordiam • Ad Verecundiam • Ad Baculum • Ad Ignorantiam • Non-sequitor 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 175
  • 176.
    Topics for Debate •Should abortion be legal? • Should death penalty be allowed? • Should prostitution be legal? • Should euthanasia be allowed? • Should gay marriage be legal? • Should divorce be legal? • Should marijuana be legal? • Should sex education be allowed? • Is animal testing justified? • Should polygamy be legal? • Is social networking good for society? • Is age important factor in relationship? • Is male superior to female? • Is money more important than love in marriage? • Should housewives be allowed to be bread winner? • Should homework be banned? • Should Priest be allowed to marry? • Should Seminarians be allowed to have girlfriends? • Does God exist? 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 176
  • 177.
    Fallacy • Fallacy – InEnglish term • Error • Prejudice • Mistaken Impression • Illusion • Fallacy – In Logical term • Fallere (Latin) to deceive • Error of reasoning • Inadequate evidence for the conclusion. • False argument that has the appearance of truth • Paralogism or ignorance • Mistake in reasoning – Mistake in judgment 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 177
  • 178.
    Sophism • Sophism – Sophistry –Fallacy committed with the intention to deceive or mislead an opponent 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 178
  • 179.
    Formal Fallacies • Fallaciesof Ambiguity – Fallacies of clearness – Contain ambiguous words or phrases – Confusion in the meaning of words • Logical Fallacies 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 179
  • 180.
    Dichotomy • “Either .. . Or” statement is used • The alternatives are falsely presented exhaustively • Eliminating the undesirable alternative, leaving the desirable alternative • E.g. – Either you let me have a grand debut party or I will be miserable for the rest of my life. I know you do not want me to be miserable for the rest of my life, so it follows that you will have me a grand debut party. – Either you will cheat or fail in the examination. Surely you do not want to fail the examination. Therefore, you will cheat. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 180
  • 181.
    Equivocation • The sameword or phrase is used with two or more meanings • E.g. – A law can be repealed by legislative authority. The law of gravity is a law. Therefore, the law of gravity can be repealed by the legislative authority. – No designing persons are to be trusted; But, architects are people who make designs; Therefore, architects are not to be trusted. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 181
  • 182.
    Amphiboly • The grammatical constructionof a sentence is not clear and is therefore open to different interpretation • E.g. – John told Bob that he had made a mistake. It follows that John has at least the courage to admit his own mistakes – My mother told your mother that she should go to the SSS office – The dog of a lady with long tail is lost 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 182
  • 183.
    Composition • What istrue of the parts of a whole is also true of the whole thing • Taking collectively what should be taken individually • The whole is this because the parts are these • E.g. – A feather is light. Therefore, a plastic containing a billion feathers is light. – Each member of the orchestra is excellent, so the orchestra is excellent. – Each player on this basketball team is an excellent athlete. Therefore, the team as a whole is excellent. – Every atom in my body is invisible. Therefore, I am invisible. – Each brick in this building is rectangular in shape. Ergo, this building must be rectangular in shape. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 183
  • 184.
    Division • What istrue of the whole is also true of the parts of the whole thing • Taking individually what should be taken collectively • The parts are these because the whole is this • E.g. – Salt is a nonpoisonous compound. Therefore, its component elements, sodium and chlorine, are non- poisonous. – The senate passed the RH Law. Ergo, every member of the senate is in favor to it. – Humans are the only animals capable of philosophical thinking. Thus, every person is capable of philosophical thinking. – Since a nation is powerful, every individual citizen of that nation is powerful.02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 184
  • 185.
    Accent • Arises fromthe mistaken interpretation of a statement but the mistake is due to the ambiguity in the way the statement is spoken • The arguer illegitimately stresses one or more words in the given statement and then proceeds to draw a conclusion based on the resultant interpretation • E.g. – Woman without her man is useless. – Recycle clothes and waste paper. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 185
  • 186.
    Prosody • Contains aword that is: – Misleading – Confusing • E.g. – Thou shall not covet thy neighbor's wife. However, Mr. Santos is not my neighbor. Ergo, I can covet his wife. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 186
  • 187.
    Figure of Speech •Argues from the construction of one word to the form and the construction of another • E.g. – Insecure is contradictory of secure. Insincere is also the contradictory of sincere. Ergo, inflammable is the contradictory of flammable. – Anybody restless is not restful. Anybody careless is not careful. Ergo, anybody helpless is not helpful. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 187
  • 188.
    Informal Fallacies • Fallaciesof Relevance – Overlooks the fact – No connection between the premises and the conclusion – Argument relies on premises that are not relevant to its conclusion and ergo cannot establish its truth • Material Fallacies 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 188
  • 189.
    Argumentum ad baculum •Appeal to force – Use of threat • physical or psychological – Physical force or moral pressure rather than the merit of the point at issue – Discourse of power – Pointing out their powers over you – Warning you of the bad consequences of refusing to accept their argument • E.g. – Thus there is ample proof of the truth of the Bible. All those who refuse to accept that truth will burn in Hell. – Ladies and gentlemen of the jury, if you do not bring in a verdict of guilty, you may be this killer’s next victim! 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 189
  • 190.
    Argumentum ad baculum •Appeal to force – Use of threat • physical or psychological – Physical force or moral pressure rather than the merit of the point at issue – Discourse of power – Pointing out their powers over you – Warning you of the bad consequences of refusing to accept their argument • E.g. – Be home by nine tonight or you can forget about the increase in allowance next week. – You better agree to my proposal or you won't see your family anymore. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 190
  • 191.
    Argumentum ad baculum •Appeal to force – Use of threat • physical or psychological – Physical force or moral pressure rather than the merit of the point at issue. – Discourse of power – Pointing out their powers over you – Warning you of the bad consequences of refusing to accept their argument. • E.g. – You have just heard the new policies in our company. They are effective immediately. Anyone who disagrees may now resign. The portal of the company is open. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 191
  • 192.
    Argumentum pansarilum • Argumentto one’s own advantage – Offer would be heed unless advantage will be given regardless of morality • E.g. – I will pay for your mother’s hospital bill provided that we will sleep together tonight 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 192
  • 193.
    Argumentum ad misericondiam •Appeal to pity – Causes sympathy – Pleading for mercy and disregarding the point in argument – Pity or sympathy must be irrelevant to the issue • Relevant – Hungry beggar who begs for food – A man who on bended knees appeals to a criminal to spare his life • E.g. – We cannot condemn this man because he is the only one that supports his family. – I did not murder my mother and father with an axe! Please don't find me guilty; I'm suffering enough through being an orphan. – Imelda Marcos cries over jury on Yamashita trial. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 193
  • 194.
    Argumentum ad misericondiam •Appeal to pity – Causes sympathy – pleading for mercy and disregarding the point in argument – Pity or sympathy must be irrelevant to the issue • Relevant – Hungry beggar who begs for food – A man who on bended knees appeals to a criminal to spare his life • E.g. – A student should be given a passing grade because he is soon to graduate, or because if he fails the course his parents would disown him. – Vote for this candidate because he has already put in a lot of money and heartache in the campaign. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 194
  • 195.
    Argumentum ad misericondiam •Appeal to pity – Causes sympathy – Pleading for mercy and disregarding the point in argument. – Pity or sympathy must be irrelevant to the issue • Relevant – Hungry beggar who begs for food – A man who on bended knees appeals to a criminal to spare his life • E.g. – I hope you could add more compassion in your heart by letting me pass in this bar examination. Anyway, I am already old. To retire as a full-pledge lawyer is all I dream of. – Please accept me to work in your company. I have 5 children to feed and my wife is bed ridden. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 195
  • 196.
    Argumentum ad crumenam •Believing that money is a criterion of correctness • Those with more money are more likely to be right • E.g. – Microsoft software is undoubtedly superior; why else would Bill Gates have gotten so rich? – Apple must be the best manufacturer of quality gadgets, why else would it be so expensive? – Give me a passing mark Sir, and we will talk about the payment. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 196
  • 197.
    Argumentum ad lazarum •Lazarus – Jesus raised from being dead • Assuming that someone poor is sounder or more virtuous than someone who's wealthier • E.g. – Priests are more likely to possess insight into the meaning of life, as they have given up the distractions of wealth. – Tenants of Hacienda Luisita should be given a parcel of land from the vast land of Cojuanco because they have work hard on it. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 197
  • 198.
    Argumentum ad populum •Appeal to the people or appeal to emotion – Enthusiasm and emotional support – Attempts to win popular assent using emotive language – Mobilizing public sentiment – Direct or Indirect • E.g. – Legalize cockfighting because many people are engaging in it anyway. – The constitution is defective because many people want it to be amended. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 198
  • 199.
    Argumentum ad populum •Direct – Excite the emotion and enthusiasm of the crowd – Arouse a kind of mob mentality – Employs emotional charge phraseology • E.g. – Political campaigns • Iboto si Jingoy Estrada, Anak ng Ama ng masa, Anak ng bawat masa. – Slogans – Labels 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 199
  • 200.
    Argumentum ad populum •Indirect – Appeal is addressed to one or more individuals separately • E.g. – Bandwagon • 9 out of 10 Moms trust Lactum. You will be left behind if you do not use the product. – Vanity • “Only Belo touches my skin.” – Kris Aquino – Snobbery • An apple gadget is not for everyone. If you think you belong to the select few, this distinguished smart phone is for you! 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 200
  • 201.
    Argumentum ad antiquitatem •Antique – Old • Asserting that something is right or good simply because it's old • That's the way it's always been • E.g. – For thousands of years Christians have believed in Jesus Christ. Christianity must be true, to have persisted so long even in the face of persecution. – UST must be the best institution for being the oldest in Asia. – UIC must be guided by the holy spirit because it stands for a century. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 201
  • 202.
    Argumentum ad novitatem •Novitiate – New • Asserting that something is better or more correct simply because it is new • E.g. – The Clash of Clans is way cooler than Super Mario because it was just in market last week. – Kia vehicles are more durable than Toyota vehicles because it is the newest brand in the market. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 202
  • 203.
    Poisoning the well •No chance has the second man got if the first man calls him a liar before he even begins talking • E.g. – Two men are having a debate. The first one gets up and says, 'My opponent is a notorious liar. You can't believe a word that he is going to say.' 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 203
  • 204.
    Argumentum ad hominem •Attack against the person – Attack is not at the conclusion of an opponent but at the person of the opponent himself – Attack upon the person rather than the persons’ ideas. – What he says should not be believed because of his character flaw – Attacking the person instead of proving or disproving the point at issue • Abusive • Circumstantial • Tu quoque 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 204
  • 205.
    Argumentum ad hominem •Abusive – Attack is directly against a person seeking to defame or discredit him • Opponent possesses a certain undesirable or negative characteristic • Opponents’ words or abilities are not to be trusted because of that characteristic • E.g. – Well now, you have all heard Professor Clark tell us about the theory of evolution. But I am not surprised that he neglected to tell you that he is a godless atheist! How can this man speak the truth, I ask you? 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 205
  • 206.
    Argumentum ad hominem •Circumstantial – Opponent has self- centered interest on the topic • E.g. – The mall industry lobbyists have been arguing that tax reform is not necessary. But just remember this: it is the mall industry that stands to benefit the most if there is no change in the current tax laws. – A student of UM predicts that the basketball team of ADDU will win the championship match. A fellow student of UM might raise his eyebrows and ask him, "Where does your loyalty belong to, anyway?"02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 206
  • 207.
    Argumentum ad hominem •Tu quoque – Shifting the burden of guilt – One defends oneself by accusing the attacker of usually similar wrongdoing. – “Two wrongs do not make a right” so that even if the arguer is right in attacking his accuser, he has not defended himself against the charge – Character of an individual is logically irrelevant to the truth or falsehood of what the person says – May persuade by the psychological process of transference • E.g. – Yes, I admit, I cheated on you last night. But you also cheated on me before. – You say I’m not pretty? Well, you’re not pretty as well. How can you be in the position to say that? 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 207
  • 208.
    Argumentum ad vercundiam •Appeal to misplaced or inappropriate authority – Claimant is not authorized to discuss the subject matter – Based not on the intrinsic merits of the claim but on the prestige or fame of the person endorsing the claim – Appeal to authority with respect to matters outside his specialization • E.g. – How can that definition of love be questioned, criticized or doubted when it was Blaise Pascal, a known mathematician who gave that. – My assignment in Logic is not wrong. Miss Rowling, my English teacher who is known internationally as a novelist, confirmed my answer. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 208
  • 209.
    Critique on Argumentumad vercundiam by Prof. Sam Bernales, Jr. • Defending the misplaced or inappropriate authority – Claimant may not be an expert to discuss the subject matter but the argument may be accepted based on the person’s passion on the subject matter. • E.g. – Giorgio Tsoukalos of Ancient Aliens, History Channel, discusses about the presence of Aliens in Ancient History of the World. Giorgio Tsoukalos is a graduate of Bachelor of Arts in Mass Communication major in Sports Communication. However, he still merited by the prestigious History Channel based on his enthusiasm on the subject. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 209
  • 210.
    Argumentum ad ignorantiam •Appeal to ignorance – Proposition is true • because it has not been proved false – Proposition is false • because it has not been proved true – Lack of evidences • E.g. – Well, I have examined all the arguments for the existence of God, and I have seen that none of them proves that God exists. That is reason enough for me: there is no God! – Angela Frank is a paragon of honesty because she never cheats. – I am sure that the students have understood the instructions perfectly well because no one raised a hand to ask anything on my lesson. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 210
  • 211.
    Dicto simpliciter • Accident –A general rule is applied wrongly to a specific case – From general to particular • E.g. – Jogging is good for the health. Ergo, a newly-heart-operated patient should always jog for good health. – Freedom of speech is a constitutionally guaranteed right. Therefore, that radical communist should not be arrested for his speech that incited that riot last week. – All good soldiers should obey their superiors' orders. Therefore, they should also obey the captain even if he is exceedingly in authority. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 211
  • 212.
    Dicto simpliciter • Accident –A general rule is applied wrongly to a specific case – From general to particular • E.g. – One has to tell the truth always. Thus, if a murderer confesses his crime to a priest, it is but proper for the priest to reveal the truth to the authority. – Customer is always right. Therefore, the cashier should return my money because I changed my mind after purchase. – A good student abides the teacher. Ergo, a beautiful student should abide the teacher who implies indecent favor. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 212
  • 213.
    Dicto simpliciter • Accident –A general rule is applied wrongly to a specific case – From general to particular • E.g. – Killing is immoral. Ergo, soldiers and policemen should not kill in the face of threat. – Households should obey their masters. Ergo, domestic helpers should obey their masters imposing sexual assault. – Every citizen has the right to bear arms. Ergo, Sisa, who has been declared insane, should not be disarmed. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 213
  • 214.
    Dicto simpliciter • Accident –Accident is given more emphasis rather than the Essence • E.g. – Mr. Estrada is not my father. My father is not a drunkard, a womanizer and a gambler. – You are not my boyfriend. I have no cheating boyfriend. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 214
  • 215.
    Converse accident • Hastygeneralization – Conclusion is drawn out of the sample that is not a representative of the group – One moves carelessly or too quickly from a single case to a broad generalization – From particular to general • E.g. – I know that Philosophers are weird and odd people because I have seen that in my teachers behavior. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 215
  • 216.
    Post hoc • FalseCause – The link between premises and conclusion depends on some imagined causal connection that does not exist – Superstitious beliefs or Oversimplification • E.g. – It rains whenever she arrives, ergo to avoid rains we must not invite her to come over. – During the past two months, every time that the cheerleaders wore blue ribbons in their hair, the basketball team was defeated. Therefore, to prevent defeats in the future, the cheerleaders should get rid of those blue ribbons. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 216
  • 217.
    Post hoc • FalseCause – Superstitious beliefs • Cultural • Pass on from one generation to another • E.g. – He met an accident because it was Friday the 13th . – A black cat crossed my path and later I tripped and sprained my ankle. It must be that black cats are really bad luck. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 217
  • 218.
    Post hoc • FalseCause – Oversimplification • An arguer explains the occurrence of some event or phenomenon in terms of one or more of its least important causes • E.g. – I blame the television media for the epidemic of hijackings, kidnappings, and other acts of terrorism. If we would stop televising terrorist acts, they would stop. – The divorce rate in America has been climbing steadily. At the same time, the number of juveniles getting into trouble with the law has shoot up. Something must be done about the divorce rate since it is causing such a rapid increase in juvenile delinquency. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 218
  • 219.
    Non-sequitor • It doesnot follow – Conclusion does not necessarily follow from our premises • E.g. – I love you therefore it follows that you love me. – She is the most beautiful student in this University ergo she should be given a scholarship. – He goes to Church everyday ergo it is impossible for him to do corruption. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 219
  • 220.
    Ignoratio elenchi • Ignoranceof the proof – Irrelevant conclusion – Missing the point • Draws a conclusion that misses the point entirely • E.g. – Crimes of theft and robbery have been increasing at an alarming rate lately. The conclusion is obvious: we must reinstate the death penalty immediately. – The man is currently suffering from amnesia and has no recollection whatever of the event of the past two weeks. We can only conclude that he did not commit the crime of murdering his neighbor, as he has been accused of doing. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 220
  • 221.
    Contradictory Premise • Premisescontradict each other • E.g. – If God can do anything, can He make a stone so heavy that He won't be able to lift it? But if He can do anything, He can lift the stone. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 221
  • 222.
    Genetic • Taking theorigin as evidence • E.g. – Ferdinand Marcos Jr. was raised by his Father who declared Martial Law. It is clear that upon winning the Presidential election, Ferdinand Marcos Jr. will also declare Martial Law. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 222
  • 223.
    False Dilemma • 1of the 2 claims was proven false. Therefore, the other is doubtless true. • Jejomar Binay and Mar Roxas are both running for Presidency. Jejomar Binay was accused of corruption. Therefore we should vote for Mar Roxas for President. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 223
  • 224.
    Petitio principii • Beggingthe question – Circular argument • The premise of the argument is simply a reinstatement of the conclusion • E.g. – Birds know how to fly because they have wings and wings can make them fly. – Philosophers are highly intelligent individuals because if they were not highly intelligent they would not be philosophers. – The Bible asserts that God exists. The Bible is the divine word of God. Therefore, God exists. – "Why are you here?" "Because I'm not there.“ – Declarative sentence is the sentence that declares. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 224
  • 225.
    Complex question • Aquestion is asked in such a way as to presuppose the truth of some assumption buried in that question • 1 Question (Actually 2 questions) = 1 Answer • E.g. – Have you stopped cheating on your girlfriend? – Do you still cheat on exams? – Is this the knife you used to kill the victim? – Where did you hide the money you stole? – What did you use to wipe your fingerprints from the gun? 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 225
  • 226.
    False analogy • Theanalogy is not strong enough to support the conclusion that is drawn • The assumption is that if two or more things are alike in some respects, they are alike in some other respect • Analogy or resemblance is not sufficient to warrant the conclusion • E.g. – Bobby’s new car is bright blue, has leather upholstery, and is expensive. Crowley’s new car is also bright blue and has leather upholstery. Therefore, it is also expensive. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 226
  • 227.
    Hypothesis Contrary toFact • Hypothesis that is not true and then draw any supportable conclusions from it • E.g. – If Madame Curie had not happened to leave a photographic plate in a drawer with a chunk of pitchblende, the world today would not know about radium. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 227
  • 228.
    Slippery slope • Claimsthat a certain event will set off a chain reaction, leading in the end to some undesirable consequence, yet there is no sufficient reason to think that the chain reaction will actually take place • E.g. – Attempts to outlaw pornography threaten basic civil rights and should be summarily abandoned. If pornography is outlawed, censorship of newspapers and news magazines is only a short step away. After that there will be censorship of textbooks, political speeches, and the content of lectures delivered by university professors. Complete mind control by the central government will be the inevitable result. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 228
  • 229.
    Slippery slope • Claimsthat a certain event will set off a chain reaction, leading in the end to some undesirable consequence, yet there is no sufficient reason to think that the chain reaction will actually take place • E.g. – Studying philosophy is a dangerous thing to do. It makes you critical., which in turn makes you skeptical of your religious beliefs. And once you have begun to lose faith in your religion, it is a small step to atheism and immorality, and a life of immorality is damned. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 229
  • 230.
    Red herring • Thearguer diverts the attention of the reader or listener by addressing a number of extraneous issues and ends by presuming that some conclusion has been established • The fallacy got its name from the practice of using a herring, a particularly smelly fish when cooked, to divert hunting dogs from the scent of a fox • Directing attention away from the issue to other seemingly related issues • E.g. – Friends and neighbors I urge you to defeat the proposal to make jail sentences mandatory for drunk drivers. My opponent claims that it will reduce the number of accidents caused by drunk drivers. But if we really want to reduce traffic accidents, then we should stand behind those men and women whose chief responsibility is our safety. I am referring of course, to our valiant police officers, what we need to do is increase their salaries, beef up the police force, and, most importantly, stop butting into their business with troublesome people. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 230
  • 231.
    Red herring • E.g. –I agree with my opponent that pornography is a national problem, and I am almost persuaded by his argument that women are being degraded and victimized by pornography. I say, almost persuaded... until I remember the facts that my opponent obviously overlooks: namely, that the people of South Africa are not merely degraded and victimized, they are deprived of every right due a human being. And what I do not understand is how we convince ourselves that our so called national problem takes precedence over genuine oppression and suffering.02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 231 • The arguer diverts the attention of the reader or listener by addressing a number of extraneous issues and ends by presuming that some conclusion has been established • The fallacy got its name from the practice of using a herring, a particularly smelly fish when cooked, to divert hunting dogs from the scent of a fox • Directing attention away from the issue to other seemingly related issues
  • 232.
    Suppressed evidence • Underminesthe premises of a good argument, causing it to be unsound • Passing off what are at best half-truths as if they were the whole truth thus making a defective argument appears to be good • E.g. – The second amendment to the constitution states that the right of the people to keep and bear arms shall not be infringed. But a law controlling handguns would infringe on the right to keep and bear arms. Therefore, a law controlling hand guns would be unconstitutional.02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 232
  • 233.
    Appeal to Pride •Undermines the premises but the focus of the argument is the personal pride • E.g. – Of course, the painting is beautiful. I painted it myself. – I am beautiful because my mother says so. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 233
  • 234.
    Argumentum ex silentio •Argument from Silence – is to express a conclusion that is based on the absence of statements in historical documents – Implying answer based on silence • E.g. – The beheading of captives did not happen yesterday because it was not on the newspaper. – God does not exist because there are no evidence of His existence. 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 234
  • 235.
    Activity • Topic – Fallacy •Instruction – Identify the particular fallacy committed for each item – Only one item has Good Argument – Write your answer on the space provided 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 235
  • 236.
    Symbolic Logic • Symbolsand Meanings Copi Notation English Expression Name Meaning ~ Not Negation Not, not the case, false, wrong • + ↑ and Conjunction And, yet, but, however, moreover, nevertheless, still, also, although, both / or v or Disjunction Or, unless, either or Ͻ If or then Conditional or implication If…then…, implies, only if, entails that, provided that, on condition that If and only if Biconditional or equivalence If and only if or is equivalent to 02/10/17 03:00 AM Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr. 236
  • 237.
    Ad Majorem DeiGloriam! 02/10/17 03:00 AM 237 Critical Thinking and Correct Reasoning Prof. Sam Bernales, Jr.
  • 238.
    10-238 All rights reserved. Nopart of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. Published in the Republic of the Philippines.

Editor's Notes

  • #38 Collective: Males, Particular: 80% of Males, Singular: This Place, Universal, Table, Chair, Door, Camera