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# Bijection

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A bijection is a function f : X -> Y that is

1. injective (or one-to-one), that is, for every y in Y there is at most one x in X such that f(x) = y, and
2. surjective (or onto), that is, for every y in Y there is at least one x in X such that f(x) = y.

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Last edited July 26, 2001 8:10 am (diff)
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