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Keywords:
congruence permutable semigroups; varieties of semigroups; varieties of regular $*$-semigroups; generators
congruence permutable semigroups; varieties of semigroups; varieties of regular $*$-semigroups; generators
Summary:
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.
References:
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