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 Jan 15 asked Different versions of Mercer's theorem Jan 6 answered $E(X\mid X+Y)$, where $X$ and $Y$ are independent $U(0,1)$. Apr 6 answered Why are additional constraint and penalty term equivalent in ridge regression? Nov 15 answered When will $AB=BA$? Apr 19 asked Givens rotation and retraction mapping Mar 24 asked Generic points as coefficients of polynomial kernels? Jan 23 asked Correspondence between an order of rational function field and a Dedekind cut Jan 15 answered Mnemonic for cross product Jun 17 answered Suppose that a $3\times 3$ matrix $M$ has an eigenspace of dimension $3$. Prove that $M$ is a diagonal matrix. Apr 17 asked About the spectral radius of a kind of matrices Apr 17 asked Prove or disprove: the spectral radius of a matrix with negative entries and row sums as 1 is larger than 1 Apr 16 asked Textbooks on modern optimization (on machine learning) with exercises Feb 1 asked The positive-definite-ness of RBF kernel Oct 21 asked Questions about algebraic manifold on matrices Sep 26 answered Solve $3\sqrt{x+4}-2\sqrt{x-11}+5\sqrt{x-8}=0$ Jun 12 asked Compound Poisson process with exponential distribution Apr 23 answered Need help solving Recursive series defined by $x_1 = \sin x_0$ and $x_{n+1} = \sin x_n$ Apr 14 asked Similarity between $I+N$ and $e^N$ when $N$ is nilpotent Oct 17 asked How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? Sep 25 asked Solution to a system of linear equations in GF(2)