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Displaying similar documents to “Perspectivity and congruence in partial abelian semigroups”

Commutative zeropotent semigroups with few invariant congruences

Robert El Bashir, Tomáš Kepka (2008)

Czechoslovak Mathematical Journal

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Commutative semigroups satisfying the equation 2 x + y = 2 x and having only two G -invariant congruences for an automorphism group G are considered. Some classes of these semigroups are characterized and some other examples are constructed.