Arjang
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 1d revised Can a picture be it's own pie chart? deleted 20 characters in body 1d revised Can a picture be it's own pie chart? added 90 characters in body 1d revised Can a picture be it's own pie chart? deleted 178 characters in body; edited title 1d revised Can a picture be it's own pie chart? added 178 characters in body 1d comment Can a picture be it's own pie chart? It is suppose to be a picture that at the same time is also a pie chart of what is in the picture, but if that is true then the pie chart is also the picture! so the pie chart and what it represents are like fix point that translate back from one to other. 1d revised Can a picture be it's own pie chart? edited title 1d asked Can a picture be it's own pie chart? 2d comment Find $\lim_{n\to\infty} \frac{1}{n}\left(1+\frac{1}{2}+\frac{1}{3}+\dotsb+\frac{1}{4n-1}+\frac{1}{4n}\right)^5.$ @cncritic : what was the solution? 2d accepted Is there any partial sums of harmonic series that is integer? 2d comment Is there any partial sums of harmonic series that is integer? @Travis , if you could put your two comments into an answer i can accept it. was about to ask how to generate such things next :) you preempted my question 2d comment Is there any partial sums of harmonic series that is integer? yep, the second one, was that obvious to you? 2d asked Is there any partial sums of harmonic series that is integer? Feb 4 answered How do I evaluate this sum :$\sum_{n=1}^{\infty}\frac{{(-1)}^{n²}}{{(i\pi)}^{n}}$? Jan 28 awarded Famous Question Jan 25 comment How to find the limit of a sum of reciprocals $\lim_{n\to\infty}(1 + \frac{1}{2} + \frac{1}{3} + \cdots+ \frac{1}{n})$? Strange, duplicate elementary problems getting too much upvotes. Jan 25 comment How to find this limit : $\lim_{n \to \infty} \frac{2-\sqrt{2+\sqrt{2 +\sqrt{2+ \cdots n \text{ times}}}}}{4^{-n}}$ What have you tried? Where is this question from? Jan 25 revised Sum $\sum_{n=1}^\infty \log\left(\frac{(n+1)^2}{n(n+2)}\right)$ edited title Jan 24 comment Coefficient of $x^{50}$ in the expansion of $\prod_{n=1}^{52}{(x+n)}$ any hints on what you have tried, what about coefficints of $x^0,x^1,x^2$? Jan 24 comment The name of the sum $\sum_{i=0}^n \frac{1}{m-i}$ This is not a different series than finite harmonic series , since it can be written as difference of two harmonic series with different uppper index or just one harmonic series with lower index starting at higher number, Jan 22 revised Sum of $\sum\limits_{n=0}^{\infty} (2n+1) (\frac{1}{2})^n = 1+\frac{3}{2}+\frac{5}{4}+\frac{7}{8}+\frac{9}{16}+…$ added 2 characters in body; edited title