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
明，也就是透过在两个集合间
个对射（对且映成的函
）
明它们的元素个相等。
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明，也就是透过在两个集合间个对射（对且映成的函）明它们的元素个相等。
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