- 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。
- Difference between ≈, ≃, and ≅ - Mathematics Stack Exchange
In mathematical notation, what are the usage differences between the various approximately-equal signs "≈", "≃", and "≅"? The Unicode standard lists all of them inside the Mathematical Operators B
- Word，插入多级列表，但是改了1. 1，第二章的2. 1也变成1. 1，随着改变而改变，这种情况怎么处? - 知乎
注1：【】代表软件中的功能文字 注2：同一台电脑，只需要设置一次，以后都可以直接使用 注3：如果觉得原先设置的格式不是自己想要的，可以继续点击【多级列表】——【定义新多级列表】，找到相应的位置进行修改
- linear algebra - How to tell if a set of vectors spans a space . . .
Generically you don't know without examing the presumed "basis" vectors You do know that three vectors are sufficient (x,y,z) to span 3-space; any fourth vector must be a linear combination of (x,y,z) There is no more room
- limx→0, (1+x)^1 x=e 为什么？ - 知乎
这个极限的推广形式 lim (x→0) (1+kx)^ (1 x) = e^k 也经常被使用。 这个极限的发现和研究在数学发展史上具有重要意义，它连接了离散与连续、代数与分析等多个数学领域，是理解指数增长和自然对数的基础。
- What does the factorial of a negative number signify?
I understand that the factorial gives the number of arrangements For example: the factorial of zero i e an empty set ( doesn't occur) is 1 As the empty set can be arranged only in 1 way - i e
- 键盘q\a\s\d四个键盘失效，而会使屏幕左上角出现数字该如何解决？ - 知乎
电脑在Microsoft edge界面中，如果不是网址区域和输入框，q、a、s、d四个键位失效，会在屏幕左上角产生新…
- What is $\sqrt {i}$? - Mathematics Stack Exchange
The square root of i is (1 + i) sqrt (2) [Try it out my multiplying it by itself ] It has no special notation beyond other complex numbers; in my discipline, at least, it comes up about half as often as the square root of 2 does --- that is, it isn't rare, but it arises only because of our prejudice for things which can be expressed using small integers
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