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Agreeable semigroups

Jackson, M. and Stokes, T. (2003) Agreeable semigroups. Journal of Algebra, 266 (2). pp. 393-417.

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This paper concerns the theory of partial maps under composition and more generally, the RC-semigroups introduced by Jackson and Stokes [Semigroup Forum 62 (2001) 279–310] (semigroups with a unary operation called (right) closure). Many of the motivating examples have a natural meet-semilattice structure; the inverse semigroup of all injective partial transformations of a set and the semigroup of all binary operations under composition are two examples. We here view the semilattice meet as an additional operation, thereby obtaining a variety of algebras with one unary and two binary operations. The two non-semigroup operations are then shown to be captured by a single binary operation, via the notion of an agreeable semigroup. We look at a number of properties of these structures including their congruences (which are uniquely determined by their restriction to certain idempotents), a relationship with so-called interior semigroups, and a natural category associated with a large variety of RC-semigroups (which includes all inverse semigroups). For example, we show that the existence of equalisers in this category is intimately connected with the existence of the natural meet-semilattice structure.

Item Type: Journal Article
Murdoch Affiliation: School of Mathematical and Physical Sciences
Journal or Publication Title: Journal of Algebra
Page Range: pp. 393-417
Publisher: Academic Press
Copyright: © 2003 Elsevier Inc.
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