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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。
- Double induction example: $ 1 + q - Mathematics Stack Exchange
You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
- factorial - Why does 0! = 1? - Mathematics Stack Exchange
Intending on marking as accepted, because I'm no mathematician and this response makes sense to a commoner However, I'm still curious why there is 1 way to permute 0 things, instead of 0 ways
- 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
- linear algebra - How to tell if a set of vectors spans a space . . .
@Javier: By definition, the rank of a matrix is the dimension off the span of its rows (which is equal to the dimension of the span of its columns); elementary row operations do not change the row space, so doing Gaussian elimination does not change the rank, it only makes it easier to tell what the rank is (if you are doing it correctly, at any rate) In summary: yes, because you are
- Mathematics Stack Exchange
Q A for people studying math at any level and professionals in related fields
- discrete mathematics - Prove that if $2^n - 1$ is prime, then $n$ is . . .
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- how to convert 1e+11 into number? - Mathematics Stack Exchange
In your example the string "1e+11" means the number $1 \cdot 10^ {+11} = 10^ {11} = 1\underbrace {00000000000}_ {11 \, "0" \mbox {symbols}}$ Note that the resulting number is given by a string as well, just a usually more familiar one, the base 10 positional system representation learned in school
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