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      Agreeable semigroups

      Jackson, Marcel; Stokes, Tim E.
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      Agreeable semigroups.pdf
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      DOI
       10.1016/S0021-8693(03)00314-4
      Link
       www.sciencedirect.com
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      Jackson, M. & Stokes, T. E.(2003). Agreeable semigroups. Journal of Algebra, 266(2), 393-417.
      Permanent Research Commons link: https://hdl.handle.net/10289/1739
      Abstract
      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.
      Date
      2003
      Type
      Journal Article
      Publisher
      Academic Press
      Rights
      This is an author’s version of an article published in Journal of Algebra. © 2003 Elsevier.
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      • Computing and Mathematical Sciences Papers [1454]
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