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 …
Sum of 1 - 1/2 + 1/3 +.... + 1/n - Mathematics Stack Exchange
One can write $$1+\frac12+\frac13+\cdots+\frac1n=\gamma+\psi(n+1)$$ where $\gamma$ is Euler's constant and $\psi$ is the digamma function. Of course, one reason for creating the …
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. …
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?
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 …
what is 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 + 1/7 - 1/8 +1/9
Nov 28, 2019 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …
空调的功率一般多大? - 知乎
1.5匹的应为2000×1.5×1.162=3486w，依此类推，大致能判断空调的匹数和制冷量。 一般情况下制冷量2300~2600W都称为一匹，3200~3600W为1.5匹，4500~5500W为2匹。 2.能效标志： …
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 …
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 …
如何看待2025江苏国补在6月1日突然暂停下线？ - 知乎
在618活动刚开始时暂停线上国补是什么原因？后续何时还会再次开启？