A Simple Proof of Completeness and Cut-elimination for Propositional G¨ odel Logic


Authors
Arnon Avron
Tel Aviv University
Abstract
We provide a constructive, direct, and simple proof of the completeness of the cut-free part of the hypersequential calculus for G¨odel logic (thereby proving both completeness of the calculus for its standard semantics, and the admissibility of the cut rule in the full calculus). We then extend the results and proofs to derivations from assumptions, showing that such derivations can be confined to those in which cuts are made only on formulas which occur in the assumptions
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Cut-Free Hypersequent Calculus for S4. 3.Andrzej Indrzejczak - 2012 - Bulletin of the Section of Logic 41 (1/2):89-104.

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