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 May4 comment How to integrate $\frac{1}{\sqrt{x^2+y^2+z^2}}$ @Francesco, your spherical coordinate convention might just be different from the OP's. May3 comment Are all mathematicians human calculators? @Mariano, Gauss did numerical analysis by hand, but of course he did not have computers, and we can't really say now if he's sane. :) On my part: I could do numerics by hand, but why should I bother? May3 revised What do these variables in the generic BBP formula mean? edited tags May3 revised A generalization of Bell numbers to arbitrary complex arguments edited tags May3 comment A generalization of Bell numbers to arbitrary complex arguments A related question. As I noted in the answer to the other question, one might consider using Cauchy's differentiation formula with an appropriate contour for numerical explorations. This is similar to the approach I made to generalize the partition numbers. May3 revised Is $K\left(\frac{\sqrt{2-\sqrt3}}2\right)\stackrel?=\frac{\Gamma\left(\frac16\right)\Gamma\left(\frac13\right)}{4\ \sqrt[4]3\ \sqrt\pi}$ added 2 characters in body May3 comment Invertible skew-symmetric matrix To jump a bit forward: odd-order skew-symmetric matrices are necessarily singular, but even-order ones don't have to be. May3 comment Handling complex arguments of elliptic integrals in Maple Most CAS suck at producing useful elliptic integral expressions. You might want to look at Byrd/Friedman and see if your particular form is in there. May3 revised Handling complex arguments of elliptic integrals in Maple edited tags May3 revised An identity involving Bernoulli and Stirling numbers edited tags; edited title May3 comment An identity involving Bernoulli and Stirling numbers See the first formula in page 133 of this paper; the proof of the associated theorem is in previous pages. May2 revised Compute the following sum added 9 characters in body May2 revised Determinant of a otherwise constant matrix with a constant diagonal added 70 characters in body; edited tags May2 revised Compute the following sum edited tags; edited tags May2 revised Writing triangular function as a piecewise function edited tags May2 awarded Revival May2 revised Diagonal factorization of upper triangluar matrix to unit uppper triangular matrix edited tags May2 comment Diagonal factorization of upper triangluar matrix to unit uppper triangular matrix Consider forming a diagonal matrix from the diagonal elements of your upper triangular matrix, and see what happens if you premultiply the inverse of this diagonal matrix to your triangular matrix. May2 revised Derivatives of the Struve functions $H_\nu(x)$, $L_\nu(x)$ and other related functions w.r.t. their index $\nu$ typo May2 comment How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen? Made my day. Thanks for the giggles!