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Regular elements in sandwich semigroups of binary relations
Authors:Melvin C. Thornton
Affiliation:Department of Mathematics and Statistics, University of Nebraska, Lincoln, NE 68588, USA
Abstract:This note gives a counterexample to a published characterization of regular elements in sandwich semigroups of binary relations. The method of that paper is used to characterize those elements having a right identity. A characterization of regular elements is obtained following the approach of Schein.
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