Javier
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 Jan 12 awarded Good Answer Dec 15 comment How to calculate$\int_0^{\infty} e^{-x^2} \sin x dx$ in the most simple way @Lucian: My comment is not as useful as I thought it would be. It would work if the limits were $\pm \infty$ (of course, the integral would be zero), but it doesn't work here because after completing the square, the limits of integration are not simple. It does let you get to the Dawson function quickly, but I thought you could get a closed form solution. Dec 15 comment How to calculate$\int_0^{\infty} e^{-x^2} \sin x dx$ in the most simple way Use $\sin x = (e^{ix}-e^{-ix})/2$. Dec 13 awarded Nice Question Nov 25 reviewed Approve Consider the following limit: $\lim_{n \to \infty } \frac{\ln(1+n)-\ln(n^{2})}{\sin(1/n)}$ Nov 13 accepted Does the matrix exponential take open sets into open sets? Nov 13 comment Does the matrix exponential take open sets into open sets? @m.g.: Well, that was simple. You should post that as an answer. Nov 13 comment Does the matrix exponential take open sets into open sets? @Jack: what about $x^2$ on $(-1,1)$? Nov 13 asked Does the matrix exponential take open sets into open sets? Nov 6 awarded Nice Question Oct 24 awarded Yearling Oct 23 awarded Notable Question Oct 8 comment How do I take the limit of this function? You must be doing something wrong: when I put in $2.1$, $2.01$, $2.001$, I get $15$, $150$, $1500$, etc. Sep 30 awarded Explainer Sep 24 awarded Autobiographer Aug 24 accepted Where does the right hand rule appear in the “tensor” definition of the cross product? Aug 24 asked Where does the right hand rule appear in the “tensor” definition of the cross product? Jul 24 answered Confusion about Spherical Coordinates Transformation Jul 15 reviewed Edit nth term derivative with f(0) plugged in Jul 15 revised nth term derivative with f(0) plugged in Improved formatting