15317 Constructive Logic
Lecture 7: Classical Logic
In this lecture we design a judgmental formulation of classical logic
based on proof by contradiction and two new judgments, A false
and # (contradiction). We give several examples of classical
proofs, pausing along the way to observe their structure. A common
underlying theme is a certain timetravelling mindchanging behavior
exhibited by classical proofs, which will become clearer when we look
at the computational interpretation of classical logic.
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Frank Pfenning
