Alex Nelson
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 Aug 5 answered Closed form for this continued fraction Aug 4 comment Name for this Sum Well, it's not Euler's constant -_-' ...I think this question is too general, since we don't know anything specific about the $a_{n}$ coefficients or the sequence of products $b_{n}=\prod^{n}_{k=0}a_{k}$... Aug 3 revised Optimize database indexes, the sequel Improved grammar Aug 3 suggested approved edit on Optimize database indexes, the sequel Aug 3 revised Optimize database indexes, the sequel Improved formatting Aug 3 suggested approved edit on Optimize database indexes, the sequel Aug 3 comment Learning math: still paper and pen When you write with a pen/pencil on paper, your brain is actually registering the words --- whereas typing registers the letters. Consequently, the overall notes written by hand (in any subject) "sticks" with you longer and better than those just typed up. Ideally, you'd write by hand on paper first, then type them up in LaTeX taking into account corrections, citations, more interesting examples, etc. etc. etc. Aug 2 comment How to solve $f\frac{\partial^2f}{\partial x\partial y} = \frac{\partial f}{\partial x}\frac{\partial f}{\partial y}$ Perhaps if you change coordinates to $z=x+\mathrm{i}y$ and $\bar{z}=x-\mathrm{i}y$, you get something along the lines of Laplace's equation. That should be a good first step... Jul 25 revised When are $3$ vectors associative in triple cross products? Improved the TeX formatting Jul 25 suggested approved edit on When are $3$ vectors associative in triple cross products? Jul 20 comment is there a notion of graded Zariski tangent space? There is a Zariski tangent space defined in this eprint, at the end of section 2.2 (on the top of page 4) is extended to a Zariski tangent superspace for a particular example therein. Jul 11 comment Approximate solution for an ODE Perhaps you should use some words... Jun 12 comment Approximate solution for an ODE Why not just make the approximation that $\pm1+\exp(l^{2})\approx\exp(l^{2})$ and $\pm l^{2}+\exp(l^{2})\approx\exp(l^{2})$? May 18 awarded Yearling May 9 awarded Caucus Dec 25 revised A relationship between matrices, bernoulli polynomials, and binomial coefficients added 1217 characters in body Dec 25 comment A relationship between matrices, bernoulli polynomials, and binomial coefficients @AndrewGibson: Many thanks for double checking my work! I really appreciate it :) Dec 25 comment A relationship between matrices, bernoulli polynomials, and binomial coefficients Oh, I hate to burst the magic: your matrix factorization is incorrect. If you carry out the matrix multiplication, you don't recover the correct matrix :( Dec 25 answered A relationship between matrices, bernoulli polynomials, and binomial coefficients Dec 25 comment A relationship between matrices, bernoulli polynomials, and binomial coefficients This phenomena is unique to 4 dimensions, it fails in 5 dimensions (although, I openly confess, I haven't done intense linear algebra calculations in a while---so I may have committed an error!).