What does $QAQ^{-1}$ actually mean? - Mathematics Stack …
2020年4月28日 · 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 for the range. Thinking of applying a vector on to the right, we get that the transformation "unrotates" the vector, applies the original transformation in the original basis ...
Why is $1/i$ equal to $-i$? - Mathematics Stack Exchange
2015年5月11日 · There are multiple ways of writing out a given complex number, or a number in general. Usually we reduce things to the "simplest" terms for display -- saying $0$ is a lot cleaner than saying $1-1$ for example.
每年一万公里左右，买油车还是电车？ - 知乎
1.关于里程焦虑。 到目前为止没有，主要两个方面：第一是家有充电桩，随时可充，蔚来70度电的，差不多8个小时充满，晚上就充着好了；电池充满的理论里程是480公里左右，我实际测算了一下，按照日常空调，大油门等，大约实际里程打7折，也就是340左右。
Formula for $1^2+2^2+3^2+...+n^2$ - Mathematics Stack …
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Double induction example: $ 1 + q + q^2 - Mathematics Stack …
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abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange
2013年1月15日 · 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. The work of G. Peano shows that it's not hard to produce a useful set of axioms that can prove 1+1=2 much more easily than Whitehead and Russell do.
如何评价电影《哪吒之魔童闹海》中的西海龙王敖闰？ - 知乎
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Series expansion: $\frac{1}{(1-x)^n}$ - Mathematics Stack Exchange
2024年12月2日 · What is the expansion for $(1-x)^{-n}$? Could find only the expansion upto the power of $-3$. Is there some general formula?
Prove that $1^3 + 2^3 + ... + n^3 = (1+ 2 + ... + n)^2$
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How can 1+1=3 be possible? - Mathematics Stack Exchange
2021年2月3日 · 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 knowledge, and build their careers.