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 Apr8 accepted Integrating $\frac{1}{(x^2+b)^{3/2}}$? Apr8 comment Integrating $\frac{1}{(x^2+b)^{3/2}}$? Do you have a better idea in mind ? Apr8 asked Integrating $\frac{1}{(x^2+b)^{3/2}}$? Apr8 asked How to integrate $I = \int_{-a/2}^{a/2}\frac{1}{\sqrt{x^2 + b}}dx$ Apr6 comment Does gaussian elimination always work? So if I Gauss a matrix A to a triangular matrix T, I might end up with different eigenvalues than those of A ? But why does it work for determinants then ? Apr6 asked Does gaussian elimination always work? Mar6 accepted Geometric interpretation of a matrix Mar6 comment Geometric interpretation of a matrix Ok if I understood correctly, the rotation doesn't change the area of a geometric figure so the determinant must be 1 and the inverse transformation is a rotation of angle $-\theta$ Mar6 asked Geometric interpretation of a matrix Nov30 accepted Factorize matrix determinant Nov30 asked Factorize matrix determinant Nov29 asked Product of Fourier transform Nov21 accepted Sign problem, Laplace transform of sin(at) Nov21 asked Sign problem, Laplace transform of sin(at) Oct30 awarded Teacher Oct30 answered Standard deviation… Oct30 comment Standard deviation… Well that's weird... "x = [-1,0,1]; stdev(x)" yields 1 on Scilab, standard deviation fonction on my phone also says 1, and Wolfram|Alpha too : wolframalpha.com/input/?i=standard+deviation+{-1%2C0%2C1} Oct30 asked Standard deviation… Oct26 awarded Curious Oct25 accepted Is this rigorous notation?