This paper give the proofs of the Keal Function "a theorem that sum aggregate enumerable set is countable aggregate".
主要讨论了《实变函数论》中定理：“可数个可数集之并是可数集”的多种证明。
This paper give the proofs of the Keal Function "a theorem that sum aggregate enumerable set is countable aggregate".
主要讨论了《实变函数论》中定理：“可数个可数集之并是可数集”的多种证明。
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