What does $QAQ^{-1}$ actually mean? - Mathematics Stack …
Apr 28, 2020 · I'm self-learning Linear Algebra and have been trying to take a geometric approach to understand what matrices mean visually. I've noticed this matrix product pop up repeatedly …
空调的功率一般多大? - 知乎
1.制冷量（3200w）和制热量（3650（4250）w），是空调的的输出功率。 这组数据表示空调的制冷和制热效果。 制冷时3200W，制热不带电加热是3650W，带上电加热是4250W，电加热功 …
卡路里、千焦、大卡傻傻分不清楚？关于热量看这一篇就够了
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），一般千焦换算成大卡可以直接除以4.18来计算如果要粗略计算热量，直接除以4即可。
summation - Sum of 1 + 1/2 - Mathematics Stack Exchange
How do I calculate this sum in terms of 'n'? I know this is a harmonic progression, but I can't find how to calculate the summation of it. Also, is it an expansion of any mathematical function? 1 ...
what is 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 + 1/7 - 1/8 +1/9
Nov 28, 2019 · Please provide additional context, which ideally explains why the question is relevant to you and our community. Some forms of context include: background and …
1加十三手机（一加13）怎么样？体验3天优缺点测评
Nov 4, 2024 · 二：一加13（1加十三手机）优点 强大的性能配置：搭载了骁龙8至尊版移动平台，这是高通最新一代的旗舰级处理器，采用台积电第二代3nm工艺制程，CPU则采用了高通自 …
Easy way to remember Taylor Series for log(1+x)?
May 2, 2015 · Assuming $|x|<1$, if one can easily remember that $$ \\dfrac{1}{1-x}=\\sum_{n=0}^{\\infty}x^{n} $$ then one can derive the following \\begin{eqnarray*} \\mbox{log ...
Exactly how does the equation n (n-1)/2 determine the number of …
Apr 2, 2017 · The formula n(n − 1)/2 n (n − 1) / 2 for the number of pairs you can form from an n n element set has many derivations, even many on this site. One is to imagine a room with n n …
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abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange
Jan 15, 2013 · Possible Duplicate: How do I convince someone that $1+1=2$ may not necessarily be true? I once read that some mathematicians provided a very length proof of $1+1=2$. Can …