Propositional Logic: The Contrapositive @PhilosophyFreak

Propositional Logic: The Contrapositive @PhilosophyFreak

Uploaded February 2013 | Updated September 2026, 3 weeks ago

criticalthinkeracademy.com

This video shows why, given a conditional claim of the form "if A then B", the contrapositive of this claim, "if not-B then not-A", is logically equivalent to the original conditional.

Propositional Logic: The Contrapositive

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Propositional Logic: The Contrapositive