Invertibility in Sequent Calculi

Title:	Invertibility in Sequent Calculi
Author:	Peter Chapman
Submission date:	2009-08-28
Abstract:	The invertibility of the rules of a sequent calculus is important for guiding proof search and can be used in some formalised proofs of Cut admissibility. We present sufficient conditions for when a rule is invertible with respect to a calculus. We illustrate the conditions with examples. It must be noted we give purely syntactic criteria; no guarantees are given as to the suitability of the rules.
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