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So there are several ways of finding general positive solutions for the equation $x^y=y^x$. But does this equation appear anywhere in physics or other science ? Or maybe there is some practical purpose for it. Thanks in advance.

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    For an overview and some applications, consult this paper by Knoebel (http://eretrandre.org/rb/files/Knoebel1981_158.pdf). –  Sep 19 '18 at 21:54

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The solution is essentially given by the Lambert W function, for which you can find a list of applications on Wikipedia:

https://en.wikipedia.org/wiki/Lambert_W_function#Applications

Does this help?

zakk
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