countable function

常見例句

雙語例句

• This paper give the proofs of the Keal Function "a theorem that sum aggregate enumerable set is countable aggregate".
  主要討論了《實(shí)變函數(shù)論》中定理：“可數(shù)個(gè)可數(shù)集之并是可數(shù)集”的多種證明。
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