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] Follow along in the Logic playlist: https://www.youtube.com/playlist?list=PLDDGPdw7e6AhsNuxXP3D-45Is96L8sdSG If you want to support the channel, hit the "JOIN" button above and pick a channel subscription that suits your needs: https://www.youtube.com/channel/UCGYSfZbPp3BiAFs531PBY7g/join Patreon: http://bit.ly/2EUdAl3 Website: http://TrevTutor.com Subscribe: http://bit.ly/1vWiRxW Facebook: http://on.fb.me/1vWwDRc *--Playlists--* Logic: https://www.youtube.com/playlist?list=PLDDGPdw7e6AhsNuxXP3D-45Is96L8sdSG *--Recommended Textbooks--* 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 Hello, welcome to TheTrevTutor. I'm here to help you learn your college courses in an easy, efficient manner. If you like what you see, feel free to subscribe and follow me for updates. If you have any questions, leave them below. I try to answer as many questions as possible.