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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.

2026全新重庆旅游攻略——详细心得分享（保姆级攻略、省时省心省钱！）
现在网上关于重庆的旅游攻略大部分都已经过时。有的人出发时查了很多攻略，结果到了重庆还是一头雾水。鉴于此，以我近期去重庆旅游的经历总结出这篇【全新重庆旅游攻略】，提供给各位。如果你能抽出3分钟看完这篇攻略——那所有问题都OK了~~~

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Whoopi Goldberg Misses The View After Erupting Volcano Leaves Her Stranded in Italy  E! News
A transition may be coming for a massive Italian volcano  Live Science
Sky News Australia. . Explosive activity at Italy's most active volcano has intensified, triggering the highest aviation warning level.  facebook.com
Mount Etna: 5 facts about Europe's most active volcano  DW.com
The Lost City of Pompeii  National Geographic Kids
Etna  Smithsonian Institution | Global Volcanism Program
10 Things To Do in Calabria, Italy  International Living
23 Best Things to Do In Sicily, Italy in 2025  The Planet D
Italian couple and son die at Solfatara volcano crater  BBC
Italy's Campi Flegrei volcano may unleash devastating eruptions more often than we thought, ancient outburst suggests  Live Science