Three weaker variants of congruence permutability for semigroup varieties.

zbMath1330.20085MaRDI QIDQ892030

Vyacheslav Yu. Shaprynskiǐ, Boris M. Vernikov

Publication date: 18 November 2015

Published in: Sibirskie Èlektronnye Matematicheskie Izvestiya (Search for Journal in Brave)

Full work available at URL: http://semr.math.nsc.ru/v11/p567-604.pdf

zbMATH Keywords

congruence latticessemigroup varietiesfully invariant congruencescongruence permutability2.5-permutability of congruencesfree objects of varietiesweak permutability of congruences

Mathematics Subject Classification ID

Lattices of varieties (08B15) Varieties and pseudovarieties of semigroups (20M07) Free semigroups, generators and relations, word problems (20M05) Subalgebras, congruence relations (08A30)

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Two weaker variants of congruence permutability for monoid varieties

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