- 知乎 - 有问题，就会有答案
知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。
- 1-1+1-1+1-1+1. . . 这个无穷数列的值是什么？如何证明？ - 知乎
知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。
- Binomial expansion of $ (1-x)^n$ - Mathematics Stack Exchange
Binomial expansion of $ (1-x)^n$ Ask Question Asked 11 years, 7 months ago Modified 5 years, 1 month ago Viewed 250k times
- arithmetic - Formal proof for $ (-1) \times (-1) = 1$ - Mathematics . . .
Is there a formal proof for $(-1) \\times (-1) = 1$? It's a fundamental formula not only in arithmetic but also in the whole of math Is there a proof for it or is it just assumed?
- 有问题，就会有答案 - 知乎
知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。
- Taylor series of $\ln (1+x)$? - Mathematics Stack Exchange
Note that $$\frac {1} {1+x}=\sum_ {n \ge 0} (-1)^nx^n$$ Integrating both sides gives you \begin {align} \ln (1+x) =\sum_ {n \ge 0}\frac { (-1)^nx^ {n+1}} {n+1}\\ =x
- 1 8, 1 4, 1 2, 3 4,7 8英寸分别是多少厘米? - 知乎
8分之一英寸（1 8 inch）等于 2 54 厘米除以 8，计算结果如下：
- What would base $1$ be? - Mathematics Stack Exchange
The examples given with base 10 and 2 in the question are positional bases In a positional base 1, you only got one digit, with no value: 0 All positions will have zero value, and you can only represent one number: 0 – Bijective base 1 would be one way to make it funcitonal, but that isn't a positional base
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