Abstract
An epigroup is a semigroup in which some power of any element lies in a subgroup of the given semigroup. The class of epigroups includes a number of important classes of semigroups. Not only some particular types of epigroups but epigroups as such can serve as the subject matter of a substantial theory. In this survey the following topics concerning epigroups are considered: epigroups as unary semigroups, certain “nice” decompositions, finiteness conditions.
The work was partially supported by the President Program of a support of the Leading Scientific Schools of the Russian Federation (grant 2227.2003.01) and by the Ministry of Education of the Russian Federation (grants E02-1.0-143 and 04.01.059).
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Dedicated to Walter Douglas Munn on the occasion of his 75th birthday
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Shevrin, L.N. (2005). Epigroups. In: Kudryavtsev, V.B., Rosenberg, I.G., Goldstein, M. (eds) Structural Theory of Automata, Semigroups, and Universal Algebra. NATO Science Series II: Mathematics, Physics and Chemistry, vol 207. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3817-8_12
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