15-815 Automated Theorem Proving
Lecture 6: Classical Logic

In this lecture we introduce classical logic from the judgmental point of view and relate it to intuitionistic logic. Classical logic can be seen as arising in a variety of ways. A particularly attractive point of view is that classical logic is based on three judgments: A true, A false, and contradiction. One basic principal is that if a proposition is true and false simultaneously, we obtain a contradiction. Conversely, every proposition must be either true or false.


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Frank Pfenning