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  • 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。
  • How do I explain 2 to the power of zero equals 1 to a child
    My daughter is stuck on the concept that $$2^0 = 1,$$ having the intuitive expectation that it be equal to zero I have tried explaining it, but I guess not well enough How would you explain the
  • How can 1+1=3 be possible? - Mathematics Stack Exchange
    Hi, welcome to Math SE! Can you show us the proof you're looking at? There are a lot of false proofs of this sort out there, typically involving division by 0, I would imagine that's probably the gimmick in the proof you've found Here's a helpful link to get a sense for how to use MathJax
  • 为什么 1 不能被认为是质数? - 知乎
    比如,用质数组合得到数字6的唯一方法是2×3(顺序不重要,所以3×2算是同一种方法)。 然而,如果我们说1也算质数的话,那么得到6的方法就还有1×2×3和1×1×2×3,等等。 1的存在会破坏一切,对我们完全没有帮助。 所以我们必须弥补这个规则中的漏洞。
  • 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
  • 知乎 - 有问题,就会有答案
    TYPE-C转接口可连接两台显示器,提供高效的多屏显示解决方案。
  • analysis - Little Small $o (1)$ notation clarification. - Mathematics . . .
    You should clarify your question Even though people may be able to guess what you want to ask, there's no need for anybody to guess I don't think it will be too hard for you to spend some more time improving your question
  • 请问这个符号 是什么长度单位? - 知乎
    电视外包装 英寸的符号是 " 或者inch (简写为in)。1"=1英寸 (inch)=2 54厘米,而1'=1英尺 (foot,符号ft)=12英寸 (12")=30 48厘米。 关于电视屏幕尺寸的计算 一般电视或显示器厂商宣传自家屏幕大小时都是习惯用长度(英寸)而不是面积来表示,例如27寸的显示器,它的显示器面板对角线长即27英寸,换算成厘米
  • Why is $1 i$ equal to $-i$? - Mathematics Stack Exchange
    There are multiple ways of writing out a given complex number, or a number in general Usually we reduce things to the "simplest" terms for display -- saying $0$ is a lot cleaner than saying $1-1$ for example The complex numbers are a field This means that every non-$0$ element has a multiplicative inverse, and that inverse is unique While $1 i = i^ {-1}$ is true (pretty much by definition





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