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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 …
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知乎是一个中文互联网高质量问答社区和创作者聚集的原创内容平台，提供知识共享、互动交流和个人成长机会。
Why is $x^{-1} = \\frac{1}{x}$? - Mathematics Stack Exchange
@turkeyhundt I don't like appealing to "common sense" results like this because it would lead one to believe that negative binomials …
Why is $1$ not a prime number? - Mathematics Stack Exchange
Why is $1$ not considered a prime number? Or, why is the definition of prime numbers given for integers greater than $1$?
有问题，就会有答案 - 知乎
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 …
1-1+1-1+1-1+1... 这个无穷数列的值是什么？如何证明？ - 知乎
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 …
Why is 1 raised to infinity Not defined and not "1" [duplicate]
$1$ square is $1$, so is raised $1$ to $123434234$. My maths teacher claims that $1$ raised to infinity is not $1$, but not defined. Is …
What is the value of $1^i$? - Mathematics Stack Exchange
Aug 30, 2010 · ${1}^{x}=1$ is not part of the definition of complex exponentiation, although it is an immediate consequence of the …
arithmetic - Formal proof for $(-1) \times (-1) = 1$ - Mathematics ...
Is there a formal proof for $(-1) \\times (-1) = 1$? It's a fundamental formula not only in arithmetic but also in the whole of math. Is …
abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange
Jan 15, 2013 · $1+1=2$ is that Principia Mathematica starts from almost nothing, and works its way up in very tiny, incremental steps. …
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