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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。
- 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
- mathtype7试用期30天到了？ - 知乎
试用期30天到了,试过删除注册表中的options7，结果还是不能免费继续试用了 怎么解决呢？
- What would base $1$ be? - Mathematics Stack Exchange
The examples given with base 10 and 2 in the question are positional bases In a positional base 1, you only got one digit, with no value: 0 All positions will have zero value, and you can only represent one number: 0 – Bijective base 1 would be one way to make it funcitonal, but that isn't a positional base
- 有哪些推荐的电脑桌面宠物软件或 App？ - 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。
- proof writing - Limit of $ (1+ x n)^n$ when $n$ tends to infinity . . .
Does anyone know the exact proof of this limit result? $$\lim_ {n\to\infty} \left (1+\frac {x} {n}\right)^n = e^x$$
- 电脑怎么打开avif格式文件? - 知乎
1、Convertio 一个文件格式转换在线工具，它支持300多种文件格式的转换，包括图片、视频、音频、文档、电子书等多种类型文件，使用的时候还不需要注册登录。 打开之后，找到图片转换器功能，就可以上传图片进行转换了。
- Derivation of Soft Thresholding Operator Proximal Operator of $ {L . . .
I wonder about something One could write the Soft Thresholding as: $$ x - \lambda \operatorname {sgn} \left ( x \right) \min \left ( \left| \frac {x} {\lambda} \right|, 1 \right) $$ This is of the form $ x - \lambda g \left ( \frac {x} {\lambda} \right) $ Using the trick done in my answer to Closed Form Solution of $ \arg \min_ {x} {\left\| x − y \right\|}_ {2}^ {2} + \lambda {\left\| x
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