Journal of Symbolic Logic

Equivalence of consequence relations: an order-theoretic and categorical perspective

Nikolaos Galatos and Constantine Tsinakis

Source: J. Symbolic Logic Volume 74, Issue 3 (2009), 780-810.

Abstract

Equivalences and translations between consequence relations abound in logic. The notion of equivalence can be defined syntactically, in terms of translations of formulas, and order-theoretically, in terms of the associated lattices of theories. W. Blok and D. Pigozzi proved in [4] that the two definitions coincide in the case of an algebraizable sentential deductive system. A refined treatment of this equivalence was provided by W. Blok and B. Jónsson in [3]. Other authors have extended this result to the cases of k-deductive systems and of consequence relations on associative, commutative, multiple conclusion sequents. Our main result subsumes all existing results in the literature and reveals their common character. The proofs are of order-theoretic and categorical nature.

Primary Subjects: 03G10
Secondary Subjects: 06F05
Keywords: Consequence relation; closure operator; equivalence; algebraizable; residuated lattice; module; projective

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Links and Identifiers

Permanent link to this document: http://projecteuclid.org/euclid.jsl/1245158085
Digital Object Identifier: doi:10.2178/jsl/1245158085
Zentralblatt MATH identifier: 05609390

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