Ordered right (left) quasi-adequate semigroups

Document Type : Research Paper

Author

Department of mathematics University of Tripoli, Libya

Abstract

In a previous paper‎, ‎the author investigated the structure of a right (left) quasi-adequate semigroup with a particular normal medial idempotent‎. ‎The subject of the current paper is an order analogue‎. ‎Namely‎, ‎we provide a structure theorem for a naturally ordered quasi-adequate semigroup $(S,\leq)$ with a maximum idempotent $u$ in which $uSu$ is an adequate subsemigroup of $S$ with the property that the relations $\L$ and $\R$ are abundant‎. ‎We achieve this result as a combination of those in the one-sided case‎.

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