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 …
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 …
Double induction example: $ 1 + q + q^2 - Mathematics Stack …
I'm working on a double induction problem with the following prompt: Prove by induction on n n that for any real number q> 1 q> 1 and integer n ≥ 0 n ≥ 0:
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 ...
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 …
5 days ago · 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指南（国补版） 吾人岛主 数码行业常驻人口（文章评论区免费咨询） 2.1 万赞同 7790 评论 1.4 万收藏
Series expansion: $\frac {1} { (1-x)^n}$ - Mathematics Stack …
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?
空调的功率一般多大? - 知乎
@知乎好物 100 看看空调铭牌上，和功率有关的，就有好几组数据，它们到底是啥意思？ 我们平常说的空调功率指的是啥？下面我一一解读一下，不完善的，朋友们可以补充。 1.平常说的功 …
How can 1+1=3 be possible? - Mathematics Stack Exchange
Feb 3, 2021 · So that's the "proof". The failure is at step 5, where you say that pq = pr p q = p r implies that q = r q = r; that's true only if you know p p is nonzero. For instance 0 ⋅ 5 = 0 ⋅ 7 0 ⋅ …
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 …
甲醛含量多少范围时，正常可以入住？ - 知乎
如下图所示，连续通风法，劣质密度板材的甲醛释放平均速率为 1.6785mg/ (㎡h) ； 闷放法，随着室内甲醛浓度的升高，“闷”的时间越长，甲醛释放速率就越降越低。