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 Nov 10 accepted Try to find an approximation by logarithm function. Oct 28 revised What's the Summation formulae of the series $2*2^0 + 3*2^1 + 4*2^2 + 5*2^3…$? added 4 characters in body Oct 28 answered What's the Summation formulae of the series $2*2^0 + 3*2^1 + 4*2^2 + 5*2^3…$? Mar 17 comment CDF of Euclidean distance between two points. Hi @DaleM, may I ask a question based on your answer? How to get the distribution of $D_{sp}$, based on $D_{sp}=\sqrt{R^2+a^2-2Ra\cos\theta}$? Thank you! Mar 1 awarded Popular Question Sep 23 accepted does it have a name : $\prod\left(1-x_i\right)$ Sep 6 revised maximizing a quadratic over linear function deleted 149 characters in body Sep 2 revised maximizing a quadratic over linear function added 1 character in body Aug 27 asked Closed-form solution of the following LP problem Aug 27 comment May I know that there is a special structure or solution on this linear fractional optimization? Thanks @Adrian Schad. The answer is correct and I am clear now. Aug 27 accepted May I know that there is a special structure or solution on this linear fractional optimization? Jul 2 awarded Curious Jun 30 comment maximizing a quadratic over linear function Hi @Rahul, Thank you! It really helps. Jun 29 revised maximizing a quadratic over linear function Almost re-write the problem. Jun 27 revised maximizing a quadratic over linear function added 13 characters in body Jun 23 revised maximizing a quadratic over linear function Explain the details. Jun 22 asked maximizing a quadratic over linear function May 22 comment May I know that there is a special structure or solution on this linear fractional optimization? @mvw. This result is reasonable, since if we take the partial derivative to the objective function, it is non-zero in general, which means the maximum value should be on the boundary. But I don't know whether it is hold in a general $n$, and the result is still all 0 except one $x_i=c$. May 22 comment May I know that there is a special structure or solution on this linear fractional optimization? For the case $n=2$, it is shown that the result is always ${x_1=c,x_2=0}$ or ${x_1=0,x_2=c}$. May 22 revised May I know that there is a special structure or solution on this linear fractional optimization? edited tags