Syllogistic unity


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Proving the equivalence of all valid syllogism using the pictorial object logic

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Syllogistic unity

  1. 1. Syllogistic Unity Proving the Equivalency of All Syllogisms Using Object Logic Armahedi Mahzar © 2011
  2. 2. Foreword Logic is the science of thinking as it is discovered by Aristotle. In his treatise of syllogism he used alphabets to represent concept in his verbal logic. George Boole created an algebra of logic by representing logical operations with mathematical symbols besides letters as variables. These symbolizations is still linear literal. Charles Sanders Peirce rewrote boolean algebra in a planar pictorial symbols by using pictures as the symbols of logic, but he still used alphabets as the symbols of variables. The pictorial symbolization is also used by George Spencer-Brown having a half of a box, which he called cross, to replace the ovals of Peirce Louis Kauffman replaced the Brownian cross with a complete box in his pictorial Box Algebra of logic. In the following slides we will make the Box Algebra more pictorial, by replacing letters with colored objects to get an Object Logic. Finally, we will use the Object Logic to prove the astounding fact of Syllogistic Unity.
  3. 3. Part One: Logic Algebra of Objects In this part the Boolean algebra is made pictorial by Replacing letters with colored objects Replacing mathematical symbols with boxes configuration
  5. 5. Two Interpretations of Kauffman Box Algebra Kauffman Box algebra is a rewriting of the Spencer-Brown “Laws of Form” Algebra But it can also be interpreted as rewriting of the Existential Graph Algebra of Peirce The following presentation follows Peircean interpretation with colored marbles as variables
  7. 7. Basic Box Arithmetic LAW OF NEGATION LAW OF CONJUNCTION From this Box Arithmetic we can build a logic algebra discovered by George Boole. Alfred North Whitehead and Bertrand Russel derived the whole Boolean Algebra on five axioms. George Spencer-Brown reduced the axiom into just two axiom in his Laws of Form Primary Algebra. Louis Kaufman reduced the axioms to just one in his Box Algebra.
  8. 8. Axiom of the Logic Box Algebra The single Axiom for Logical Box Algebra is Huntington tautology
  9. 9. The Meaning of the Axiom: Reductio ad Absurdum The Huntington Axiom box diagram is The diagram can be read as Red is True if and only if Not Red implies Blue and Not Red implies Not Blue which is equivalent to Red is True if only if Not Red implies a Contradiction the Reductio ad Absurdum principle
  10. 10. Rules of Inference Rule of Substitution any variable can be replaced by a function of other variables Rule of Replacement a function of variables can be replaced by another equivalent function of the same variables Using these rules we can derive all Boolean tautologies, some of them is in the following page.
  11. 11. Agebraic Identities (logical tautologies) are theorems Law of Absorption Law of Negation Law of Contradiction Law of (De)iteration
  12. 12. Implication in BOX algebra Logical Proposition IF p THEN q = TRUE NOT p OR q = TRUE p AND NOT q = FALSE NOT (p AND NOT q)= TRUE In the NAND box algebra notation it is represented by In Boolean Notation (p q) =1 p’ + q = 1 p x q’ = 0 (p x q’ )’ = 1
  13. 13. Part Two : Syllogism In this part we will reformulate syllogism in a boolean formula which is drawn as picture of enclosing boxes containing colored objects that represents concepts.
  14. 14. Syllogism as an Implication “IF p AND q THEN r” represented by p, q and r are fundamental propositions p and q are premises r is conclusion
  15. 15. Aristotle Fundamental Propositions
  16. 16. Facts of Syllogism Every Valid Syllogism is a Tautology Leibnitz proved that there are only 24 Valid Syllogisms We will use the NAND interpreted box algebra of Kauffman to prove The syllogistic unity: all valid syllogisms is equivalent to each other
  17. 17. The names of the valid syllogisms are Using symmetric properties and Boolean Identity , we have only to prove just the Barbara syllogism validity.
  18. 18. BARBARA syllogism Syllogism Barbara = [[b[c]][a[b]]a[c]]
  19. 19. Proof of the validity of Barbara Syllogism (All Red is Green & All Green is Blue is Blue)=TRUE = = deiteration All Red = = absorption contradiction negation
  20. 20. Part 3 : Syllogistic Unity In this part we will prove the unity of valid syllogisms by using its permutational symmetry, the algebraic substitution and the equivalency of different algebraic expressions
  21. 21. STEP 1: Barbara Triad Barbara, Baroco and Bocardo are equivalent to each other. All can be represented by single box diagram Barbara Amp Asm Asp Baroco Apm Osm Osp Bocardo Omp Ams Osp
  22. 22. STEP 2: Celarent Zodiac The twelve syllogisms are equivalent to each other. All can be represented by a single box diagram Camestres: Arg Egb Camenes : Arg Ebg Celarent : Egb Arg Cesare : Ebg Arg Ebr Ebr Erb Erb Datisi Darii Disamis Diramis : Arg Ibr : Arg Irb : Ibr Arg : Irb Arg Ibg Ibg Igb Igb Ferio Ferison Festino Fresison : Egb Irb : Ebg Irb : Egb Ibr : Ebg Ibr Org Org Org Org
  23. 23. STEP 3: Celaront Triad Celaront, Cesaro and Darapti are equivalent to each other. All can be represented by single diagram Celaront Emp Asm Osp Cesaro Epm Asm Osp Darapti Amp Ams Isp
  24. 24. STEP 4: Barbari Hexad Barbari, Camestros, Felapton, Bramantip, Calemos and Fesapo are equivalent to each other. All can be represented by single box diagram Barbari Amp Asm Isp Camestros Apm Esm Osp Felapton Emp Ams Osp Bramantip Apm Ams Isp Calemos Apm Ems Osp Fesapo Epm Ams Osp
  25. 25. Step 5: Syllogistic Equivalence Barbara = Celarent by substituting with Celarent = Barbari by replacing with Celarent = Celaront by replacing with
  26. 26. 24 valid syllogisms
  27. 27. Conclusion: Syllogistic Unity Due to all the members of the Barbara triad, Celarent zodiac, Barbari hexad and Celaront triad are equivalent to each other, and the equivalency of BarbaraBarbari-Celarent-Celaront, all of the 24 syllogism is a member of a single equivalent class: the union of the four classes. This fact can be called as the Syllogistic Unity
  28. 28. Afterword The fact of syllogistic unity is anticipated by Christine LaddFranklin who had shown that all valid syllogisms can be derived from her particular antilogism formula: In fact the formula is just one of the 24 valid antilogisms which are equivalent to each other, from each of them we can also derive all valid syllogism.
  29. 29. References Aristotle : Non-Mathematical Verbal Logic George Boole: Algebraic Symbolic Logic (Algebra of Logic) Charles Sanders Peirce: Algebraic Graphical Logic (Existential Graph) George Spencer-Brown: Algebraic Graphical Logic (Laws of Form) Louis Kauffman: Algebraic Pictorial Logic (Box Algebra)