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Epimorphisms and pseudovarieties (2504.13311v1)
Published 17 Apr 2025 in math.GR
Abstract: For each of the following conditions, we characterize the pseudovarieties of semigroups V that satisfy it: (i) every epimorphism to a member of V is onto; (ii) every epimorphism to a finite semigroup with domain a member of V is onto; (iii) for every epimorphism from S to T with S in V and T finite, T is also a member of V.
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