Equivalence Relation
"For a relation in set S to be an equivalence relation, it has to satisfy three conditions: it has to be reflexive, symmetrical, and transitive ."(Schuijer 2008, p.29-30) "Indeed, an informal notion of equivalence has always been part of music theory and analysis. PC set theory, however, has adhered to formal definitions of equivalence" (Schuijer 2008, 85).
Read more about this topic: Set Theory (music)
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