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Characterizations of commuting relations. (English) Zbl 1116.08001
Summary: We give some necessary and sufficient conditions for two preorders, tolerances, resp. equivalences $$R$$ and $$S$$ on the same set to commute with respect to composition.

##### MSC:
 08A02 Relational systems, laws of composition 03E20 Other classical set theory (including functions, relations, and set algebra)
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##### References:
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