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Formal Logic.docx

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Department
Philosophy
Course
Philosophy 2250
Professor
Lorne Falkenstein
Semester
Fall

Description
Formal Logic 9/13/2013 11:19:00 AM In-Class Examples: (A = ~A) v~B  1. A is SL  2. ~A is SL  3.(A=~A) is SL  4. B is SL  5. ~B is SL  6. ((A=~A) v ~B) add outer brackets  7. (A=~A) v ~B drop outer brackets [A&~A]  1. A , rule 1  2. ~A, rule 2  3. (A&~A), rule 3 BC  4. [A&~A], [ - convention A= (~A v ~B)  A, A, B are sentence letters by SL  ~A and ~B are sentences by ~ rule.  (~A v ~B) is a sentence by BC rule  (A= (~A v ~B)) 1,4, BC rule  A= (~A v ~B) 5, convention. Corrections from last lecture: *Do not apply parentheses when using ~ rule. *Meta-variables are boldfa
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