15-317 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 triple-negation elimination (not not not A implies not A).


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Frank Pfenning