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.
DOI : 10.21136/MB.1991.126027
Classification : 08A30, 08B10, 20M07, 20M17
Keywords: congruence permutable semigroups; varieties of semigroups; varieties of regular $*$-semigroups; generators 
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     title = {On permutability in semigroup varieties},
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     pages = {396--400},
     publisher = {mathdoc},
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Pondělíček, Bedřich. On permutability in semigroup varieties. Mathematica Bohemica, Tome 116 (1991) no. 4, pp. 396-400. doi : 10.21136/MB.1991.126027. http://geodesic.mathdoc.fr/articles/10.21136/MB.1991.126027/

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