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.
们主要关心的是对射的证明，也就是透过在两个集合间建立一个对射（一对一且
成的函数）来证明它们的元素个数相等。
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.
们主要关心的是对射的证明，也就是透过在两个集合间建立一个对射（一对一且成的函数）来证明它们的元素个数相等。
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