Propositional Logic Tautologies, Contradictions, and Contingencies

In this video on #Logic / #PhilosophicalLogic, we learn about tautologies (wffs which are always true), contradictions (wffs which are always false), and contingent wffs (wffs which are both true and false depending on the situation). Then we do some practice exercises.

0:00 [Intro]
0:16 [Tautology]
2:16 [Contradiction]
5:29 [Contingent Wffs]
8:18 [Example Question]

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The Logic Book: https://amzn.to/31h2qR8
Modal Logic for Philosophers (Garson): https://amzn.to/3dECGn4
A Friendly Introduction to Mathematical Logic: https://amzn.to/37hMYZa
An introduction to Formal Logic with Philosophical Applications: https://amzn.to/3j3J9sx

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