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https://www.zhihu.com/tardis/bd/art/409772605
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https://www.zhihu.com/?L=0
What is the value of $1^i$? - Mathematics Stack Exchange
...${1}^{x}=1$ is not part of the definition of complex exponentiation, although it is an immediate consequence of the definition of natural number exponentiation. A second point that can be confusing is that the function ez e z ${e}^{z}$ used above is really the complex exponential function exp(z) exp (z)...
https://math.stackexchange.com/questions/3668/what-is-the-value-of-1i
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 there a proof for it or is it just assumed?...
https://math.stackexchange.com/questions/304422/formal-proof-for-1-times-1-1
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https://www.zhihu.com/question/2054255700407055156
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https://www.zhihu.com/question/24917424
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https://www.zhihu.com/question/19952889
Diameter of a circle touching three inner circles of diameter 1
...If the diameters of three three inner circle are $1$ meter, what is the radius of the big circle? (Note: the OP provided own answer below, after getting a hint)....
https://math.stackexchange.com/questions/919445/diameter-of-a-circle-touching-three-inner-circles-of-diameter-1
analysis - Little/Small $o(1)$ notation clarification. - Mathematics ...
...As I mentioned in my answer, an algorithm cannot have a running time less than 1 step,whereas ?k ? k $\mathrm{\forall }k$ includes constants less than 1. o(1) o (1)...
https://math.stackexchange.com/questions/29100/little-small-o1-notation-clarification
What are the three cube roots of -1? - Mathematics Stack Exchange
...What are the three cube roots of -1? Not sure if this is a trick question, But I have been asked this. one of the ansers is -1, what are the other 2?...
https://math.stackexchange.com/questions/8760/what-are-the-three-cube-roots-of-1