**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]

## 1.**Example**: Examples of Relations

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[577] **Knauer Ulrich**: “Diskrete Strukturen – kurz gefasst”, Spektrum Akademischer Verlag, 2001

[979] **Reinhardt F., Soeder H.**: “dtv-Atlas zur Mathematik”, Deutsche Taschenbuch Verlag, 1994, 10

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