Topological representations of algebraic systems, partially ordered set, H-class, Transformation groups and semigroups (topological aspects), Article, Semigroups of transformations, relations, partitions, etc., 510.mathematics, ideal extension, Partial orders, general, Schuetzenberger group, closed relations, semigroup of binary relations, Mappings of semigroups, strongly reducible relations, Green's relations, rectangular band, General structure theory for semigroups