Bijection

A bijective function, f: X → Y, where set X is 1, 2, 3, 4 and set Y is A, B, C, D. For example, f(1) = D.

In mathematics, a bijection, bijective function or one-to-one correspondence is a function between the elements of two sets, where every element of one set is paired with exactly one element of the other set, and every element of the other set is paired with exactly one element of the first set. There are no unpaired elements. In mathematical terms, a bijective function f: X → Y is a one-to-one (injective) and onto (surjective) mapping of a set X to a set Y.

单词	Bijective Function
释义	Bijective Function 原声例句 TED-Ed（视频版） And in bijective functions, each element had perfect one to one correspondence. 而在双射函数中，每个元素都具有完美的一一对应关系。英语百科 Bijection In mathematics, a bijection, bijective function or one-to-one correspondence is a function between the elements of two sets, where every element of one set is paired with exactly one element of the other set, and every element of the other set is paired with exactly one element of the first set. There are no unpaired elements. In mathematical terms, a bijective function f: X → Y is a one-to-one (injective) and onto (surjective) mapping of a set X to a set Y.
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Bijective Function

Bijection