Section 9.1
Section 9.1. Relations and their Properties. Binary Relation from A to B. Let A and B be sets. A binary relation from A to B is a subset of A x B. Example. Let A = { a, b, c } and B = { x, y } then A x B = {(a,x), (a,y), (b,x), (b,y), (c,x), (c,y)}
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