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 Mar 31 awarded Revival Feb 14 reviewed No Action Needed spectral density of Guassian random matrix Feb 14 reviewed Leave Open Prove that, if both solutions of ${ x }^{ 2 }+ax+b=0$ are even integers, then a and b are both even integers. Feb 14 reviewed Leave Open Linear Algebra matrices question. Feb 9 comment Dimension of the sum of subspaces @Leon, they are the same thing. Jan 31 revised Should I trust Mathematica or numerous other sources on this Fourier transform added 3 characters in body Jan 28 comment How/why does matrix multiplication work to do a linear fit? Yeah guys, I agree with Chris. He has a concrete problem (or rather a solution) he needs to understand. To understand this, he might have to dive deeper on some aspects. It does not help him, nor is it very constructive, to point out that he needs to "learn more about X". Jan 28 comment How/why does matrix multiplication work to do a linear fit? It might be easier to explain if you post the pseudocode of what you are doing and what the procedure you found is doing. By the way, what is IDL? Jan 18 awarded Yearling Dec 21 comment If $A\in\Bbb \{\pm1,0\}^{n\times n}$ is symmetric of rank \$