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.
我们主要关心的是对射的证明，也就是
两
集合间建立
对射（对且映成的函
）来证明它们的元
相等。
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.
我们主要关心的是对射的证明，也就是两集合间建立对射（对且映成的函）来证明它们的元相等。
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