Characterization of some  -congruence-free completely regular Semigroups

Let  be an equivalence relation on a semigroup. We - congruence-free semigroups,extending the notion of congruence-free semigroups, and classify all completely regularsemigroups which are -congruence-free, where  is one of Greens relations H, L and Drespectively.

کلیدواژه ها:

Congruence ،  -Congruence-free semigroup ، Band ، Completely regular semigroup