Geodesic
Semigroups of continuous selfmaps for which Green's and I relations coincide
Glasgow mathematical journal, Tome 20 (1979) no. 1, pp. 25-28

Voir la notice de l'article provenant de la source Cambridge University Press

For algebraic terms which are not defined, one may consult [2]. The symbol S(X) denotes the semigroup, under composition, of all continuous selfmaps of the topological space X. When X is discrete, S(X) is simply the full transformation semigroup on the set X. It has long been known that Green's relations and I coincide for [2, p. 52] and F. A. Cezus has shown in his doctoral dissertation [1, p. 34] that and I also coincide for S(X) when X is the one-point compactification of the countably infinite discrete space. Our main purpose here is to point out the fact that among the 0-dimensional metric spaces, Cezus discovered the only nondiscrete space X with the property that and I coincide on the semigroup S(X). Because of a result in a previous paper [6] by S. Subbiah and the author, this property (for 0-dimensional metric spaces) is in turn equivalent to the semigroup being regular. We gather all this together in the following 
Jr, K. D. Magill. Semigroups of continuous selfmaps for which Green's and I relations coincide. Glasgow mathematical journal, Tome 20 (1979) no. 1, pp. 25-28. doi: 10.1017/S0017089500003670
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[1] 1.Cezus, F. A., Green's relations in semigroups of functions, Ph.D. thesis at Australian National University, Canberra, Australia (1972). Google Scholar

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[5] 5.Magill, K. D. Jr and Subbiah, S., Green's relations for regular elements of semigroups of endomorphisms, Canad. J. Math. 26 (1974), 1484–1497. Google Scholar | DOI

[6] 6.Magill, K. D. Jr and Subbiah, S., Green's relations for regular elements of sandwich semigroups II; semigroups of continuous functions, J. Austral. Math. Soc. 25 (1978), 45–65. Google Scholar | DOI

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