Geodesic
A multiplication of $e$-varieties of orthodox semigroups
Archivum mathematicum, Tome 31 (1995) no. 1, pp. 43-54 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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We define semantically a partial multiplication on the lattice of all e–varieties of regular semigroups. In the case that the first factor is an e–variety of orthodox semigroups we describe our multiplication syntactically in terms of biinvariant congruences.
We define semantically a partial multiplication on the lattice of all e–varieties of regular semigroups. In the case that the first factor is an e–variety of orthodox semigroups we describe our multiplication syntactically in terms of biinvariant congruences.
Classification : 08B15, 20M07, 20M19
Keywords: regular semigroup; orthodox semigroup; inverse semigroup; e–variety; biinvariant congruence 
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Kuřil, Martin. A multiplication of $e$-varieties of orthodox semigroups. Archivum mathematicum, Tome 31 (1995) no. 1, pp. 43-54. http://geodesic.mathdoc.fr/item/ARM_1995_31_1_a4/

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