The free ample monoid

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JournalInternational Journal of Algebra and Computation
DatePublished - Jun 2009
Issue number4
Volume19
Number of pages28
Pages (from-to)527-554
Original languageEnglish

Abstract

We show that the free weakly E-ample monoid on a set X is a full submonoid of the free inverse monoid FIM(X) on X. Consequently, it is ample, and so coincides with both the free weakly ample and the free ample monoid FAM(X) on X. We introduce the notion of a semidirect product Y * T of a monoid T acting doubly on a semilattice Y with identity. We argue that the free monoid X* acts doubly on the semilattice Y of idempotents of FIM(X) and that FAM(X) is embedded in Y * X*. Finally we show that every weakly E-ample monoid has a proper ample cover.

    Research areas

  • Free, ample, weakly ample, ADEQUATE SEMIGROUPS, INVERSE SEMIGROUPS, UNIPOTENT MONOIDS, PROPER COVERS, A SEMIGROUPS, CATEGORIES

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