Document Type: Original Manuscript

Author

• Gh. Moghaddasi

Department of Mathematics, Hakikm Sabzevari University, P.O.Bo 397, Sabzevar, Iran.

Abstract

In this paper we study the notions of cogenerator and subdirectly irreducible in the category of S-poset. First we give some
necessary and sufficient conditions for a cogenerator $S$-posets. Then we see that under some conditions, regular injectivity implies generator and cogenerator. Recalling Birkhoff's Representation Theorem for algebra, we study subdirectly irreducible S-posets and give this theorem for the category of ordered right acts over an ordered monoid. Among other things, we give the relations between cogenerators and subdirectly irreducible S-posets.

Keywords

• S-poset
• cogenerator
• regular injective
• subdirectly irreducible