15317 Constructive Logic
Recitation 2: Tutch
We reviewed local soundness and completeness by examining an
invented connective ♣(A, B, C) that was locally sound
but not locally complete.
Then we took a tour of Tutch, the Tutorial Proof Checker, a piece of
software you'll be using throughout the first part of the course for
your homeworks. We proved two simple constructive theorems:
falsehood is the unit of disjunction (A or false is equivalent to
A), and triplenegation elimination (not not not A implies
not A).
References:
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Frank Pfenning
