Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/14506

 Title: A nilpotent generated semigroup associated with a semigroup of full transformations Author(s): Howie, John M.Smith, M. Paula Marques Keywords: SemigroupNilpotentsTransformationsCardinal Issue date: 1988 Publisher: Cambridge University Press Journal: Proceedings of the Royal Society of Edinburgh : Section a Mathematics Abstract(s): Let $X$ be a set with infinite regular cardinality $m$ and let $\mathcal T(X)$ be the semigroup of all self-maps of $X$. The semigroup $Q_m$ of ‘balanced’ elements of $\mathcal T(X)$ plays an important role in the study by Howie [3,5,6] of idempotent-generated subsemigroups of $\mathcal T(X)$, as does the subset $S_m$ of ‘stable’ elements, which is a subsemigroup of $Q_m$ if and only if $m$ is a regular cardinal. The principal factor $P_m$ of $Q_m$, corresponding to the maximum $\mathcal J$-class $J_m$, contains $S_m$ and has been shown in [7] to have a number of interesting properties. Let $N_2$ be the set of all nilpotent elements of index 2 in $P_m$. Then the subsemigroup  of $P_m$ generated by $N_2$ consists exactly of the elements in $P_m\backslash S_m$. Moreover $P_m\backslash S_m$ has 2-nilpotent-depth 3, in the sense that $N_2\cup N_2^2 \subset P_m\backslash S_m=N_2 \cup N_2^2\cup N_2^3$. Type: Article URI: http://hdl.handle.net/1822/14506 DOI: 10.1017/S0308210500026615 ISSN: 0308-2105 Peer-Reviewed: yes Access: Open access Appears in Collections: CMAT - Artigos em revistas com arbitragem / Papers in peer review journals

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