Geodesic
On permutability in semigroup varieties
Mathematica Bohemica, Tome 116 (1991) no. 4, pp. 396-400

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The paper contains characterizations of semigroup varieties whose semigroups with one generator (two generators) are permutable. Here all varieties of regular $*$-semigroups are described in which each semigroup with two generators is permutable.
The paper contains characterizations of semigroup varieties whose semigroups with one generator (two generators) are permutable. Here all varieties of regular $*$-semigroups are described in which each semigroup with two generators is permutable.
DOI : 10.21136/MB.1991.126027
Classification : 08A30, 08B10, 20M07, 20M17
Keywords: congruence permutable semigroups; varieties of semigroups; varieties of regular $*$-semigroups; generators 
Pondělíček, Bedřich. On permutability in semigroup varieties. Mathematica Bohemica, Tome 116 (1991) no. 4, pp. 396-400. doi: 10.21136/MB.1991.126027
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