Arjang
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 Feb 7 accepted Is there any partial sums of harmonic series that is integer? Feb 7 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 Feb 7 comment Is there any partial sums of harmonic series that is integer? yep, the second one, was that obvious to you? Feb 7 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 Jan 22 comment Derivative of a vector with respect to a matrix Also, I like your thinking, just make it explicit as what the definition should be. Jan 22 comment Derivative of a vector with respect to a matrix That totally depends on definition being used. Jan 19 comment is this correct $\lim_{ n \to \infty} \sum_{k=2^n}^{2^{n+1}} \frac{1}{k}= \ln 2$? yes, now it is easy with your result. Jan 19 asked is this correct $\lim_{ n \to \infty} \sum_{k=2^n}^{2^{n+1}} \frac{1}{k}= \ln 2$? Jan 16 awarded Nice Question Jan 15 comment How many dots do I have to write? You wont be doing the dots, you will use \cdots tex, latex,mathjax as so $\cdots$ Jan 14 accepted Example of two analytic functions that differ at countably infinity many point Jan 14 comment Example of two analytic functions that differ at countably infinity many point @CameronWilliams : is it even possible with the case analytic everywhere? I didnt think it would, but that is not a proof of course