**Relation**

A set of ordered pairs.

For example, {(1, 2), (3, 4), (1, *a*), (5, *r*)} is a relation. So is the set {(*x*, *y*): *y = x*^{2}}; this is the set of all ordered pairs (*x*, *y*) for which *y = x*^{2}.

**See also**

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