(A B) (B A), (A B) (A B) (A B) (B A) isa

mars03

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(A B) (B A), (A B) (A B) (A B) (B A) isa

“(A ∙ B) ⊃ (B ⊃ A), (A ≡ B) ⊃ (A ∙ B) ∴ (A ≡ B) ⊃ (B ⊃ A)” isa

▸ modus tollens

▸ modus ponens

▸ contraposition

▸ hypothetical syllogism

▸ disjunctive syllogism

Textbook

How to Think Logically

Edition: 2^nd

Authors: Seay, Nuccetelli

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This helped my grade so much Perfect

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