PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 40(54), pp. 1722 (1986) 

A GENERALIZATION OF EQUIVALENCE RELATIONSMarica D. Presi\'cMatematicki fakultet, Beograd, YugoslaviaAbstract: A many sorted generalization, called {\it case relation}, of the notion of equ'valence relation is given. Some fundamental properties of the case relations are proved, such as: some set theoretical characterizations and a formula which describes all case relations of the given sets. Classification (MSC2000): 08A99 Full text of the article:
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