Displaying similar documents to “Semigroups whose regular ... -classes form well-ordered chains.”

Pointed principally ordered regular semigroups

T.S. Blyth, G.A. Pinto (2016)

Discussiones Mathematicae General Algebra and Applications

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An ordered semigroup S is said to be principally ordered if, for every x ∈ S there exists x* = max{y ∈ S | xyx ⩽ x}. Here we investigate those principally ordered regular semigroups that are pointed in the sense that the classes modulo Green's relations ℒ,ℛ,𝒟 have biggest elements which are idempotent. Such a semigroup is necessarily a semiband. In particular we describe the subalgebra of (S;*) generated by a pair of comparable idempotents that are 𝒟-related. We also prove that those...