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 Feb25 awarded Yearling Dec8 awarded Caucus Sep24 awarded Autobiographer Jul25 answered How to prove $\lim_{n \to \infty} e^n \cdot \left( \sum_{k=0}^{n-1} ({k-n \over e})^k/k! \right)- 2 \cdot n = \frac 23$? Jul2 awarded Curious Jun30 awarded Tumbleweed Jun23 asked Enumerating possible values of a mapping between surface and interior of sphere. Feb25 awarded Yearling Jan3 awarded Popular Question Nov17 revised Question that can not be solve analytically . deleted 27 characters in body Nov17 answered Question that can not be solve analytically . Jun11 comment How to calculate circumference of circle in $L^p$? Interesting observation. I had made the plot but didn't notice the relation. May7 awarded Caucus Feb25 awarded Yearling Jun12 comment is the approximation of the sum true? Well, it doesn't seem to hold. What are the limits of $l, n$ that it is supposed to? Jun12 answered Dividing by 1000 twice? Jun9 comment How do I show that this function is always $> 0$ @AndrewSalmon: "for $x<0$". Besides, for $x>0$ the original inequality is obviously true. Jun9 comment How do I show that this function is always $> 0$ @DonAntonio Sure :) Jun9 revised How do I show that this function is always $> 0$ deleted 21 characters in body Jun9 comment How do I show that this function is always $> 0$ Well, not so much (unless I'm mistaken) but I don't want to give away the answer.