The Endotopism Semigroups of a Partial Equivalence Relation
Yu. V. Zhuchok, Elena Aleksandrovna Toichkina · Siberian Mathematical Journal · 2021
We study the endotopism semigroups of a nonreflexive partial equivalence. We describe the existence conditions for six types of endotopisms and provide necessary and sufficient conditions for the regularity and coregularity of each of the endotopism semigroups of a given type.