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## Definition: Relation

Let $$S_1, \ldots, S_n$$ be (not necessarily different) sets. Any subset of the Cartesian product $$R\subseteq S_1\times \ldots\times S_n$$ is called an $n$-ary relation or just a relation.

| | | | | created: 2014-04-02 21:40:09 | modified: 2016-09-04 18:39:05 | by: bookofproofs | references: [577], [979]

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