Band decomposition of weakly exponential semigroups.
Bi-ideals in Clifford ordered semigroup
In this paper we characterize both the Clifford and left Clifford ordered semigroups by their bi-ideals and quasi-ideals. Also we characterize principal bi-ideal generated by an ordered idempotent in a completely regular ordered semigroup.
Biordered sets and complemented modular lattices.
Biregular semigroups. II