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並前往https://math.colorado.edu/~jonathan.wise/teaching/math2001-fall-2014/q25s.pdf

Definition 1. Let A and B be sets. A relation from A to B is a set ...

A relation from A to B is a set of ordered pairs (a, b) such that a ∈ A and b ∈ B. In other words, a relation from A to B is a subset of A × B.

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