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Title: Green index and finiteness conditions for semigroups
Authors: Gray, Robert Duncan
Ruskuc, Nik
Keywords: Finiteness conditions
Index
Residual finiteness
Local finiteness
Complete rewriting-systems
Subsemigroups
Subgroups
Monoids
QA Mathematics
Issue Date: 15-Oct-2008
Citation: Gray , R D & Ruskuc , N 2008 , ' Green index and finiteness conditions for semigroups ' Journal of Algebra , vol 320 , no. 8 , pp. 3145-3164 .
Abstract: Let S be a semigroup and let T be a subsemigroup of S. Then T acts on S by left and by right multiplication. If the complement S \ T has finitely many strong orbits by both these actions we say that T has finite Green index in S. This notion of finite index encompasses subgroups of finite index in groups, and also subsemigroups of finite Rees index (complement). Therefore, the question of S and T inheriting various finiteness conditions from each other arises. In this paper we consider and resolve this question for the following finiteness conditions: finiteness, residual finiteness, local finiteness, periodicity, having finitely many right ideals, and having finitely many idempotents. (c) 2008 Elsevier Inc. All rights reserved.
Version: Postprint
Status: Peer reviewed
URI: http://hdl.handle.net/10023/2144
DOI: http://dx.doi.org/10.1016/j.jalgebra.2008.07.008
ISSN: 0021-8693
Type: Journal article
Rights: This is an author version of this article. The published version (c) 2008 Elsevier Inc. is available at www.sciencedirect.com
Appears in Collections:University of St Andrews Research
Pure Mathematics Research



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