We will be concerned primarily with bijective proofs, i.e., showing that two sets have the same number of elements by exhibiting a bijection (one-to-one correspondence) between them.
我们主要关心的是
的
，也就是透过在两
集合间建立一（一一且
成的函数）
它们的元素数相等。
的We will be concerned primarily with bijective proofs, i.e., showing that two sets have the same number of elements by exhibiting a bijection (one-to-one correspondence) between them.
我们主要关心的是的，也就是透过在两集合间建立一（一一且成的函数）它们的元素数相等。
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