Optimal strong Mal’cev conditions for congruence meet-semidistributivity in locally finite varieties

Jelena Jovanović,Petar Marković,Ralph McKenzie,Matthew Moore

Algebra Universalis（2016）

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摘要

Locally finite, congruence meet-semidistributive varieties have been characterized by numerous Mal’cev conditions and, recently, by two strong Mal’cev conditions. We provide three new strong Mal’cev characterizations and a new Mal’cev characterization each of which improves the known ones in some way.

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关键词

Mal’cev condition,variety,congruence meet-semidistributive,constraint satisfaction problem,tame congruence theory

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