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CHARACTERIZING SOME COMPLETELY REGULAR SEMIGROUPS BY THEIR SUBSEMIGROUPS
- Part of
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- Journal:
- Journal of the Australian Mathematical Society / Volume 94 / Issue 3 / June 2013
- Published online by Cambridge University Press:
- 07 June 2013, pp. 397-416
- Print publication:
- June 2013
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- Article
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We consider several familiar varieties of completely regular semigroups such as groups and completely simple semigroups. For each of them, we characterize their members in terms of absence of certain kinds of subsemigroups, as well as absence of certain divisors, and in terms of a homomorphism of a concrete semigroup into the semigroup itself. For each of these varieties
$ \mathcal{V} $ we determine minimal non-
$ \mathcal{V} $ varieties, provide a basis for their identities, determine their join and give a basis for its identities. Most of this is complete; one of the items missing is a basis for identities for minimal nonlocal orthogroups. Three tables and a figure illustrate the results obtained.
