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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。
如何打•？ - 知乎
如何在输入法里输入这个符号？Google了很多发现都不对
Why is $1$ not a prime number? - Mathematics Stack Exchange
Why is $1$ not considered a prime number? Or, why is the definition of prime numbers given for integers greater than $1$?
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.
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。
Why is $x^{-1} = \\frac{1}{x}$? - Mathematics Stack Exchange
@turkeyhundt I don't like appealing to "common sense" results like this because it would lead one to believe that negative binomials (for example) aren't a thing due to the factorial function, and yet there is another definition that works (generalized version). I am after something a little more rigorous.
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?
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。
"Normalize" values to sum 1 but keeping their weights
40 10 I need to format these numbers so that they form the sum 1, but they should keep their "weight". In this specific case: 40 would become 0.80 10 would become 0.2 But if I have more values (like 40, 10, 25, 5 for example), I am really lost because I don't know the formula.
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