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  1. 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 …

  2. 知乎 - 知乎

    知乎是一个可信赖的问答社区,汇集了各行各业的亲历者、内行人和领域专家,为用户提供高质量的内容和交流机会。

  3. Why is $1/i$ equal to $-i$? - Mathematics Stack Exchange

    May 11, 2015 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Upvoting indicates when questions and answers are useful. What's reputation …

  4. 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 …

  5. factorial - Why does 0! = 1? - Mathematics Stack Exchange

    Possible Duplicate: Prove 0! = 1 0! = 1 from first principles Why does 0! = 1 0! = 1? All I know of factorial is that x! x! is equal to the product of all the numbers that come before it. The product …

  6. 知乎 - 有问题,就会有答案

    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。

  7. 中国朝代顺序完整表(建议收藏) - 知乎

    Oct 16, 2022 · 中国上下5000千年历史朝代顺序为:夏朝、商朝、西周、东周、秦朝、西楚、西汉、新朝、玄汉、东汉、三国、曹魏、蜀汉、孙吴、西晋、东晋、十六国、南朝、刘宋、南齐、 …

  8. Mathematics Stack Exchange

    Q&A for people studying math at any level and professionals in related fields

  9. I have learned that 1/0 is infinity, why isn't it minus infinity?

    92 The other comments are correct: 1 0 1 0 is undefined. Similarly, the limit of 1 x 1 x as x x approaches 0 0 is also undefined. However, if you take the limit of 1 x 1 x as x x approaches …

  10. 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 …