## Quick Reference

(of a relation)

Let *R* be a binary relation on a set *S*, so that, when *a* is related to *b*, this is written *a R b*. The graph of *R* is the corresponding subset of the Cartesian product *S*×*S*, namely, the set of all pairs (*a*, *b*) such that *a R b*.

*Subjects:*
Mathematics.

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