p. 63 - 84 Isolated subsemigroups in the variants of Tn V. Mazorchuk and G. Tsyaputa Received: October 9, 2006;; Revised: August 30, 2007; Accepted: January 28, 2008 Abstract. We classify all isolated, completely isolated and convex subsemigroups in the semigroup Tn of all transformations of an n-element set, considered as the semigroup with respect to a sandwich operation. AMS Subject classification: Primary: 20M20; Secondary: 20M10. PDF Compressed Postscript Version to read ISSN 0862-9544 (Printed edition) Faculty of Mathematics, Physics and Informatics Comenius University 842 48 Bratislava, Slovak Republic Telephone: + 421-2-60295111 Fax: + 421-2-65425882 e-Mail: amuc@fmph.uniba.sk Internet: www.iam.fmph.uniba.sk/amuc © 2008, ACTA MATHEMATICA UNIVERSITATIS COMENIANAE |