Input: The user wilfully inputs a natural number from the keyboard.

输入: 用户从键盘任意输入一个自然数.

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If diverges, and a natural number, such that for any, holds, then also diverges.

如果级数发散, 且当时, 有成立, 则级数发散.

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Beyond Core Knowledge: Natural Number . " Chap . 7 in The Origin of Concepts. "

核心知识之外: 自然数〉选自《概念之源 》 第七章.

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Output: meet guess is the natural number two.

输出: 给出满足猜想的两个自然数.

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In this paper, a general formula of sum of power series of natural number is given.

本文利用函数项级数,微分及排列组合等工具推导出了一个求自然数等幂和的一个一般公式.

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Output: the Quartet is to meet the theorem up to four natural number.

输出: 给出满足四方定理中的至多四个自然数.

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