MORE ON THE NON-COMMUTATIVE EPIGROUPS WHICH ARE NOT QUASI-COMMUTATIVE
A semigroup S is called an epigroup if some power of each element lies in a subgroup of S. The aim of this paper is to give a necessary condition for an epigroup to be quasi-commutative. Moreover, we present and study an infinite class of finite non-commutative epigroups which are not quasi-commutative.
semigroup, epigroup, quasi-commutativity.
