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Series expansion: $\frac{1}{(1-x)^n}$ - Mathematics Stack Exchange
Dec 2, 2024 · What is the expansion for $(1-x)^{-n}$? Could find only the expansion upto the power of $-3$. Is there some general formula?
abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange
Jan 15, 2013 · The main reason that it takes so long to get to $1+1=2$ is that Principia Mathematica starts from almost nothing, and works its way up in very tiny, incremental steps. …
2025年6月哪一款手机性价比高？全品牌、全价位手机推荐与选购 …
2 days ago · 1、华为 作为国民品牌的华为，基本上是家喻户晓的，除了华为公司知名度高、实力雄厚之外，它的手机确实很值得称赞。 华为手机不论是是高端机还是低端机，在机子的做工 …
2025年 6月 电脑配置推荐（配置单可以直接照抄） - 知乎
2 days ago · 2025年6月台式机电脑diy配置推荐（这篇文章每月都会更新，可以收藏） 本文内配置单无任何利益相关，配置推荐以性价比为主，每月月初会及时更新，希望大家可以点赞支持一 …
What does $QAQ^{-1}$ actually mean? - Mathematics Stack …
Apr 28, 2020 · 1 $\begingroup$ When one thinks of matrix products like that, it's helpful to remember that matrices, unlike vectors, have two sets of bases: one for the domain and one …
How can 1+1=3 be possible? - Mathematics Stack Exchange
Feb 3, 2021 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …
Derivative of sigmoid function $\\sigma (x) = \\frac{1}{1+e^{-x}}$
In my AI textbook there is this paragraph, without any explanation. The sigmoid function is defined as follows $$\\sigma (x) = \\frac{1}{1+e^{-x}}.$$ This function is easy to differentiate
甲醛含量多少范围时，正常可以入住？ - 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。知乎凭借认真、专业 …
矩阵的逆怎么算？逆矩阵公式来了 (附逆矩阵计算器)
1. 高斯-约当消元法. 这是最常用的方法，通过行变换将矩阵 A 转换为单位矩阵，同时对单位矩阵进行相同的行变换，最终单位矩阵变为 A^-1。 2. 伴随矩阵法. 对于一个 n×n 的矩阵 A，其逆矩 …
Double induction example: $ 1 + q + q^2 - Mathematics Stack …
Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their …
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