Journal of Symbolic Logic

Canonical rules

Emil Jeřábek

Source: J. Symbolic Logic Volume 74, Issue 4 (2009), 1171-1205.

Abstract

We develop canonical rules capable of axiomatizing all systems of multiple-conclusion rules over K4 or IPC, by extension of the method of canonical formulas by Zakharyaschev [37]. We use the framework to give an alternative proof of the known analysis of admissible rules in basic transitive logics, which additionally yields the following dichotomy: any canonical rule is either admissible in the logic, or it is equivalent to an assumption-free rule. Other applications of canonical rules include a generalization of the Blok—Esakia theorem and the theory of modal companions to systems of multiple-conclusion rules or (finitary structural global) consequence relations, and a characterization of splittings in the lattices of consequence relations over monomodal or superintuitionistic logics with the finite model property.

Primary Subjects: 03B45, 03B55
Keywords: Inference rule; modal logic; intermediate logic; admissible rule

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Permanent link to this document: http://projecteuclid.org/euclid.jsl/1254748686
Digital Object Identifier: doi:10.2178/jsl/1254748686

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