Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-12-04T19:42:21.197Z Has data issue: false hasContentIssue false

Clifford semigroups and monotonicity

Published online by Cambridge University Press:  17 April 2009

T.E. Hays
Affiliation:
Department of Mathematics, Ohio State University, Newark, Ohio 43055, USA.
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

A semigroup S is said to be monotone if its binary operation is a monotone function from S × S into S. This paper utilizes some of the known algebraic structure of Clifford semigroups, semigroups which are unions of groups, to study topological Clifford semigroups which are monotone. It is shown that such semigroups are preserved under products, homomorphisms, and, under certain conditions, closures. Necessary and sufficient conditions for monotonicity of groups, paragroups, bands, compact orthodox Clifford semigroups, and compact bands of groups are developed.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1985

References

[1]Clifford, A.H., “Unions of groups”, Proceedings of the Second Florida Symposium on Automata and Semigroups, – (Gainsville, Florida, 1971).Google Scholar
[2]Clifford, A.H. and Preston, G.B., The algebraic theory of 8emigroups, Volume I (Mathematical Surveys, 7. American Mathematical Society, Providence, Rhode Island, 1961).Google Scholar
[3]Hays, T.E., “Monotone semigroups”, unpublished.Google Scholar
[4]Hocking, J.G. and Young, G.S., Topology (Addison-Wesley, Reading, 1961).Google Scholar
[5]Hofmann, K.H. and Mostert, P.S., Elements of conrpact semigroups (Charles Merrill, Columbus, Ohio, 1966).Google Scholar
[6]Leech, J., “The structure of band of groups”, Mem. Amer. Math. Soc. 157 (1975), 6795.Google Scholar
[7]Petrich, M., Introduction to semigroups (Charles Merrill, Columbus, Ohio, 1973).Google Scholar