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
是对射证明，也就是透过在两个集合间建立
个对射（对且映成函数）来证明它们元素个数相等。
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.
我们主要是对射证明，也就是透过在两个集合间建立个对射（对且映成函数）来证明它们元素个数相等。
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