Bourbaki

习题 11, § 7

标签 0BU4,永久不变。引用为 [Bourbaki, Tag 0BU4]。

一般拓扑, IV, 398

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考虑序列(an)(a_n),其中每个项是有限实数的有限序列和

an=bn,1+bn,2+⋯+bn,kn. a_n = b_{n,1} + b_{n,2} + \cdots + b_{n,k_n}.

对于正整数的每个对(n,p)(n, p),使得p≤knp \leq k_n,如果m=∑i=0n−1ki+pm = \sum_{i=0}^{n-1} k_i + p,则放入cm=bn,pc_m = b_{n,p}。 Show that if the series whose general term is ana_n is convergent in R\mathbf{R}, and if

dn=∣bn,1∣+∣bn,2∣+⋯+∣bn,kn∣ d_n = |b_{n,1}| + |b_{n,2}| + \cdots + |b_{n,k_n}|
tends to 0 as nn tends to infinity, then the series whose general term is cmc_m is convergent and has the same sum as the series whose general term is ana_n.

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Google 翻译生成的粗略草稿,质量较低。术语依照术语表,但句子可能有误;之后会由仔细的译文取代。