Authors: Alexander Lyaletski
Keywords: First-order classical logic, first-order intuitionistic logic, first-order modal logic, sequent calculus, deducibility, admissibility, compatibility, coextensivity, validity
Abstract
The paper is about the notions of admissibility and compatibility
and their significance for deducibility in different sequent logics including first-order classical and intuitionistic ones both without and with equality
and, possibly, with modal rules.
Results on the coextensivity of the proposed
sequent calculi with usual Gentzen and Kanger sequent calculi
as well as with their equality and modal extensions
are given.
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