1. Commutative zeropotent semigroups with few invariant congruences Creator: Bashir, Robert El and Kepka, Tomáš Format: bez média and svazek Type: model:article and TEXT Subject: commutative, zeropotent, and semigroup Language: English Description: Commutative semigroups satisfying the equation $2x+y=2x$ 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. Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public