Geodesic
A multiplication of $e$-varieties of orthodox semigroups
Archivum mathematicum, Tome 31 (1995) no. 1, pp. 43-54.

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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.
Classification : 08B15, 20M07, 20M19
Keywords: regular semigroup; orthodox semigroup; inverse semigroup; e–variety; biinvariant congruence 
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     title = {A multiplication of $e$-varieties of orthodox semigroups},
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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/