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 Mar 25 comment Euler characteristic equation for circle i wonder if approximating the circle with a regular $n$-gon will work... Mar 25 revised Find the volume of the areas bounded by following: deleted 5 characters in body Mar 25 revised Find $\lim_{a\to \infty}\frac{1}{a}\int_0^{\infty}\frac{x^2+ax+1}{1+x^4}\cdot\arctan(\frac{1}{x})dx$ added 92 characters in body Mar 25 comment Counting nonidentity elements in a group @snulty thanks, corected Mar 25 revised Counting nonidentity elements in a group deleted 5 characters in body Mar 25 revised Which book or website do you recommend for self-learning calculus? edited tags Mar 25 answered Which book or website do you recommend for self-learning calculus? Mar 25 answered Counting nonidentity elements in a group Mar 23 revised Welch's procedure proof added 6 characters in body Mar 23 comment Proving Discreteness of the Harmonic numbers @almagest we were using a different definition. I was taught that discrete means countable. You are using a different definition... Mar 23 revised Proving Discreteness of the Harmonic numbers added 7 characters in body; edited tags Mar 23 answered Proving Discreteness of the Harmonic numbers Mar 22 comment Can Levenberg-Marquardt be used to find a local minimum of a function? MATLAB certainly uses Levenberg-Marquardt for straight minimization Mar 22 revised determine the centre points of the circle added 38 characters in body Mar 22 answered determine the centre points of the circle Mar 22 revised Sturm-Liouville operator with Dirichlet BC edited tags; edited tags Mar 22 revised Sturm-Liouville operator with Dirichlet BC deleted 23 characters in body Mar 22 comment Sum of $\sum \limits_{n=0}^{\infty} \frac{1}{(kn)!}$ sum diverges at $k=0$ and conveges to $\cos (ix)$ for $k=2$ Mar 22 comment a minoration of $P(X>x)$ with $X~N(0,1)$ could you please update the question with your own thoughts on the problem and we will be happy to guide you further. Mar 22 revised a minoration of $P(X>x)$ with $X~N(0,1)$ added 1 character in body