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並前往https://math.jhu.edu/~jpaschke/Extra%20Handouts/What%20Makes%20a%20Good%20Proof.pdf

Lemma 0.27: Composition of Bijections is a Bijection

Then there is a bijective correspondence between A and C. Proof: Suppose there are bijections f : A → B and g : B → C, and define h = (g ◦ f) : ...

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