Alex Nelson
Reputation
930
Top tag
Next privilege 1,000 Rep.
Create tags
 Jul25 revised When are $3$ vectors associative in triple cross products? Improved the TeX formatting Jul25 suggested approved edit on When are $3$ vectors associative in triple cross products? Jul20 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. Jul11 comment Approximate solution for an ODE Perhaps you should use some words... Jun12 comment Approximate solution for an ODE Why not just make the approximation that $\pm1+\exp(l^{2})\approx\exp(l^{2})$ and $\pm l^{2}+\exp(l^{2})\approx\exp(l^{2})$? May18 awarded Yearling May9 awarded Caucus Dec25 revised A relationship between matrices, bernoulli polynomials, and binomial coefficients added 1217 characters in body Dec25 comment A relationship between matrices, bernoulli polynomials, and binomial coefficients @AndrewGibson: Many thanks for double checking my work! I really appreciate it :) Dec25 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 :( Dec25 answered A relationship between matrices, bernoulli polynomials, and binomial coefficients Dec25 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!). Dec25 comment A relationship between matrices, bernoulli polynomials, and binomial coefficients +1 for a great question! Dec25 suggested rejected edit on A relationship between matrices, bernoulli polynomials, and binomial coefficients Dec25 comment when does a separate-variable series solution exist for a PDE A good reference on this is Methods of Theoretical Physics by Philip McCord Morse and Herman Feshbach. Dec24 suggested rejected edit on Interpreting a limit as a derivative Dec23 comment Division into $x(x-1)$ @Tomasz but $g=4$ doesn't cleanly divide $3(3-1)=6$ for $x=3$... Dec23 revised Division into $x(x-1)$ TeX-ed it up Dec23 comment Division into $x(x-1)$ Ah yes, well played, @Marvis! Dec23 comment Division into $x(x-1)$ Also $g$ must be even...otherwise no such integer $x$ exists. So therefore $g\gt 2$, thanks to @Marvis' observation. This is wrong, thanks to a simple counter-example $g=15$, $x=6$ (thanks @Marvis!).