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
的证明，也就是透过在两个集合间建立
个（且
成的
）
证明它们的元素个相等。
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证明，也就是透过在两个集合间建立个（且成的）证明它们的元素个相等。
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