Timo Willemsen
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 Jul2 awarded Curious Sep13 awarded Yearling Jul16 asked Fitting circle into an angle Oct22 awarded Notable Question Jan25 awarded Good Question Nov17 awarded Yearling Oct16 accepted How to compute this sum Oct14 comment How to compute this sum Awesome, just what I needed :) Oct14 revised How to compute this sum edited tags Oct14 asked How to compute this sum Aug19 awarded Popular Question Aug18 accepted Proof that $C\exp(x)$ is the only set of functions for which $f(x) = f'(x)$ Aug17 awarded Nice Question Aug17 comment Proof that $C\exp(x)$ is the only set of functions for which $f(x) = f'(x)$ Austin, you're right. I've changed my question :) Aug17 revised Proof that $C\exp(x)$ is the only set of functions for which $f(x) = f'(x)$ deleted 1 characters in body Aug17 comment Proof that $C\exp(x)$ is the only set of functions for which $f(x) = f'(x)$ Whooow, cool trick, thanks for clearing this up :) It took me some time to understand it though xD The question is kinda harder then I expected :P But thanks though :D $e$ is a wonderful number. Aug17 comment Proof that $C\exp(x)$ is the only set of functions for which $f(x) = f'(x)$ @Sivaram I understand that's one of the properties of $e^x$, but I was wondering if there are any other numbers that has that property. I know there are not. But if people are so certain there's not another number that has that property, HOW do they know that. Aug17 asked Proof that $C\exp(x)$ is the only set of functions for which $f(x) = f'(x)$ May26 accepted Havel & Hakimi degree sequence theory May26 accepted Showing two definitions of a binomial coefficient are the same