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

    Generally the only reason one sees 1/0 as infinity is because some systems (incorrectly) output infinity when given dividing by zero.

  2. 1/8, 1/4, 1/2, 3/4,7/8英寸分别是多少厘米? - 知乎

    把1英寸分成8等分: 1/8 1/4 3/8 1/2 5/8 3/4 7/8 英寸。 This is an arithmetic sequence since there is a common difference between each term. In this case, adding 18 to the previous term in the sequence …

  3. Double induction example: $ 1 + q - Mathematics Stack Exchange

    Slightly relevant: you can see my answer on this thread for a proof that uses double induction (just to get you exposed to how the mechanics of a proof using double induction might work).

  4. 想请大神给小白科普一下音频声道的专业知识,什么是2.1声道、5.1声 …

    Oct 27, 2024 · 5.1声道的第一次使用,追溯到1976年,当时杜比实验室修改了Todd-AO 70毫米胶片上6个类比音轨的使用方式,但当时在电影《洛根的逃亡》中杜比实验室的光学矩阵编码系统中,没有使用 …

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

    May 11, 2015 · While 1/i = i−1 1 / i = i 1 is true (pretty much by definition), if we have a value c c such that c∗i = 1 c ∗ i = 1 then c= i−1 c = i 1. This is because we know that inverses in the complex …

  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. Formula for $1^2+2^2+3^2+...+n^2$ - Mathematics Stack Exchange

    $ (n+1)^3 - n^3 = 3n^2+3n+1$ - so it is clear that the $n^2$ terms can be added (with some lower-order terms attached) by adding the differences of cubes, giving a leading term in $n^3$. The factor 1/3 …

  8. 概率论与数理统计入门 - 知乎

    反映了人们对犯第一类错误的最大容忍程度。 ② 置信水平1-α 是显著性水平的对立面,1-α是一个概率值,当α确定时,置信水平随之确定。 置信水平反映的是人们在面对第一类错误时,希望统计…

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

    Intending on marking as accepted, because I'm no mathematician and this response makes sense to a commoner. However, I'm still curious why there is 1 way to permute 0 things, instead of 0 ways.

  10. limx→0, (1+x)^1/x=e 为什么? - 知乎

    Jun 26, 2020 · 对于 (1+1/n)^n < 3的证明如下图 (图片来自 崔尚斌数学分析教程)