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 Apr 16 asked Textbooks on modern optimization (on machine learning) with exercises Feb 5 comment The positive-definite-ness of RBF kernel @user1551 As I mentioned, I am calculating $\log\det$. Simply calling $\det$ will produce zero, while summing up the logarithm of eigenvalues is OK for large $\alpha$ since no eigenvalue will be calculated as negative. Feb 5 revised The positive-definite-ness of RBF kernel added 41 characters in body Feb 2 comment The positive-definite-ness of RBF kernel @user1551 Then how to calculate it? RBF kernel is quite common I think there should be some robust algorithms. Feb 1 asked The positive-definite-ness of RBF kernel Jan 7 awarded Popular Question Oct 25 awarded Announcer Oct 21 asked Questions about algebraic manifold on matrices Oct 7 revised How can I get sequence $4,4,2,4,4,2,4,4,2\ldots$ into equation? TeXification Oct 7 awarded Custodian Oct 7 reviewed Reviewed How can I get sequence $4,4,2,4,4,2,4,4,2\ldots$ into equation? Oct 7 suggested approved edit on How can I get sequence $4,4,2,4,4,2,4,4,2\ldots$ into equation? Oct 6 revised Given a volumen. Which is the suface, that contains it, that has minimal area? \int x3 -> \iiint Oct 6 suggested approved edit on Given a volumen. Which is the suface, that contains it, that has minimal area? Oct 6 comment Big Rudin Exercise 3.26 - Which integral is larger Can you prove the case of simple function first? Oct 5 revised Change of variables problem \int x3 -> \iiint Oct 5 suggested approved edit on Change of variables problem Oct 5 comment Vector Spaces and AC en.wikipedia.org/wiki/… says "In all models of ZF¬C there is a vector space with no basis." Oct 4 comment How to find the numbers that sum up to a given number? Hope en.wikipedia.org/wiki/Subset_sum_problem can help. Oct 1 comment Is the limit of non-decreasing sequence that is bounded equal to the upper bound? $M$ can be of course larger than $L$. Think about $a_n=1-1/n$ and $M=2$