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Herbrand-Confluence
2013
Logical Methods in Computer Science
We consider cut-elimination in the sequent calculus for classical first-order logic. It is well known that this system, in its most general form, is neither confluent nor strongly normalizing. In this work we take a coarser (and mathematically more realistic) look at cut-free proofs. We analyze which witnesses they choose for which quantifiers, or in other words: we only consider the Herbrand-disjunction of a cut-free proof. Our main theorem is a confluence result for a natural class of proofs:
doi:10.2168/lmcs-9(4:24)2013
fatcat:hbqaglgy5jbq3ohzu6dlajskyy