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- 1. Categorical versus Hypothetical Proposition Categorical proposition = declare something Hypothetical proposition = express condition
- 2. Hypothetical Proposition does not declare an unconditional affirmation or denial, but expresses a relation of dependence such as an opposition or a likeness between 2 clauses.
- 3. 3 kinds of Hypothetical Proposition 1. Conditional Proposition 2. Disjunctive Proposition 3. Conjuctive Proposition
- 4. Conditional Proposition Expresses a condition or relation of dependence between two propositions. Expressed relation points out that one proposition necessarily follows from the other because of a definite condition. Note that a conditional proposition is one in which two parts are joined by if, unless, when, where, suppose, in case. Sometimes called an if-then proposition
- 5. Conditional Proposition Examples: If a man is farsighted, he needs eyeglasses. If dry weather continues, the harvest will be poor.
- 6. Conditional Proposition Two component 1. Antecedent/Implicans Generally introduced by word IF Contains the condition 2. Consequent/Implicate Expresses the statement that follows the acceptance of condition.
- 7. Condtional Proposition Examples: If a man is farsighted, he needs eyeglasses. If a man is farsighted = Antecedent/Implicans he needs eyeglasses = Consequent/Implicate
- 8. Disjunctive Proposition One whose subject or predicate consists of parts which exclude each other. Sometimes called an either or statement due to its construction. Parts of disjunction are called disjuncts (alternants)
- 9. Disjunctive Proposition Examples: A body is either in motion or at rest. Either Pedro or Juan is dishonest.
- 10. Disjunctive Proposition o Proper (perfect,complete,strict) • It is either raining or not raining. o Improper (imperfect,incomplete) Jose is either sitting or writting. o Broad Either my sister or I will go.
- 11. Disjunctive Proposition 2 things are required for a proper disjunctive 1. The enumeration of the possibilities must be complete. 2. There must be an exclusive opposition between or among the enumerated possibilities.
- 12. Conjuctive Proposition One which denies that two contrary predicates together can be true of the same subject at the same time. The truth of a conjuctive hypothetical proposition depends solely upon a true exclusive opposition existing between their component parts. Parts of conjuctive are called conjucts
- 13. Conjuctive Proposition Examples You cannot stand and sit at the same time. You cannot be in Quiapo and in Makati at the same time.
- 14. Conjuctive Proposition Reducible to two connective hypothetical propositions or a combination of hypothetical and categorical propositions.
- 15. Conjuctive Proposition Examples If you are in Quiapo, you are not in Makati. If you are in Makati, you are not in Quiapo.

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