The free ample monoid
Fountain, John; Gomes, Gracinda M. S.; Gould, Victoria
International Journal of Algebra and Computation , 19(4) (2009), 527-554
http://dx.doi.org/10.1142/S0218196709005214
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.
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