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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 …
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：是 …
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. …
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 …
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?
卡路里、千焦、大卡傻傻分不清楚？关于热量看这一篇就够了
日常摄入热量的单位一般用“卡路里”来计算，简称卡，1千卡=1000卡（也称为1大卡）。 千焦和千卡的换算关系是：1000千焦=238.9大卡，1 大卡（千卡）=4.18千焦（KJ），一般千焦换算成 …
毕业论文正文标题五六级怎么格式？ - 知乎
1. 1.1. 1.1.1. 1.1.1.1. 金字塔结构，这种一般在成人本科论文中遇到的比较多； 这样的金字塔标题层级清晰，让读者可以很容易地理解论文的结构和内容。 以上就是我的回答如果还有什么问题 …
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 …
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 …
Prove that $1^3 + 2^3 + ... + n^3 = (1+ 2 + ... + n)^2$
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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