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ON EQUATIONAL COMPLETENESS THEOREMS

Part of: General logic Varieties Algebraic logic

Published online by Cambridge University Press:  13 September 2021

TOMMASO MORASCHINI
TOMMASO MORASCHINI*
Affiliation:
DEPARTMENT OF PHILOSOPHY UNIVERSITY OF BARCELONA CARRER DE MONTALEGRE 6 08001BARCELONA, SPAIN
*
E-mail:tommaso.moraschini@ub.edu
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Abstract

A logic is said to admit an equational completeness theorem when it can be interpreted into the equational consequence relative to some class of algebras. We characterize logics admitting an equational completeness theorem that are either locally tabular or have some tautology. In particular, it is shown that a protoalgebraic logic admits an equational completeness theorem precisely when it has two distinct logically equivalent formulas. While the problem of determining whether a logic admits an equational completeness theorem is shown to be decidable both for logics presented by a finite set of finite matrices and for locally tabular logics presented by a finite Hilbert calculus, it becomes undecidable for arbitrary logics presented by finite Hilbert calculi.

Keywords

abstract algebraic logicalgebraic semanticscompleteness theoremequational consequenceprotoalgebraic logicalgebraizable logic

MSC classification

Primary: 03G27: Abstract algebraic logic
Secondary: 08B05: Equational logic, Mal′cev (Mal′tsev) conditions 03B55: Intermediate logics 03B45: Modal logic (including the logic of norms) 03B47: Substructural logics (including relevance, entailment, linear logic, Lambek calculus, BCK and BCI logics)
Type
Article
Information
The Journal of Symbolic Logic , Volume 87 , Issue 4 , December 2022 , pp. 1522 - 1575
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of The Association for Symbolic Logic

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Footnotes

Dedicated to Professor Ramon Jansana on the occasion of his retirement

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