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hi this is an introduction to logic Im Marc Torres B in this course overviews the basics of categorical proposition or and predicate logic today were going to be looking at propositional logic well be looking at how to conduct proofs using natural deduction and today well be looking at the first five rules of replacement were using the Patrick Curley textbook but theres lots of other books out there they differ and they vary to some extent but ultimately they all essentially teach you the same thing all right guys welcome back this week were gonna be this today were gonna be looking at the rules of replacement let me start off here by doing a sort of brief review and talking about what we looked at last time in our last two videos here weve been looking at how to conduct proofs weve been looking at how to build proofs and one of the things well notice that Ive been getting a couple of the emails from people on YouTube here different different philosophers and different logi