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[SOLVED] Measurable Cauchy Function is Continuous

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[SOLVED] $g(x+y)+g(x)g(y)=g(xy)+g(x)+g(y)$ for all $x,y$.

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[SOLVED] How to calculate $f(x)$ in $f(f(x)) = e^x$?

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[SOLVED] Are all multiplicative functions additive?

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