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The least separative congruence on a completely symmetrical semigroup. (English) Zbl 0456.20039
Dep. Math., Karl Marx Univ. Econ., Budap. 1980-4, 13-17 (1980).

MSC:
20M10 General structure theory for semigroups
20M14 Commutative semigroups
20M15 Mappings of semigroups