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 Apr7 asked How to solve the least square with $L_2$ norm constraint directly? Apr6 answered Why are additional constraint and penalty term equivalent in ridge regression? Jan25 asked Equivalence of the partial least square regresssion's iterative algorithm and its optimization problem Nov15 answered When will $AB=BA$? Apr19 asked Givens rotation and retraction mapping Mar24 asked Generic points as coefficients of polynomial kernels? Jan23 asked Correspondence between an order of rational function field and a Dedekind cut Jan15 answered Mnemonic for cross product Jun17 answered Suppose that a $3\times 3$ matrix $M$ has an eigenspace of dimension $3$. Prove that $M$ is a diagonal matrix. Apr17 asked About the spectral radius of a kind of matrices Apr17 asked Prove or disprove: the spectral radius of a matrix with negative entries and row sums as 1 is larger than 1 Apr16 asked Textbooks on modern optimization (on machine learning) with exercises Feb1 asked The positive-definite-ness of RBF kernel Oct21 asked Questions about algebraic manifold on matrices Sep26 answered Solve $3\sqrt{x+4}-2\sqrt{x-11}+5\sqrt{x-8}=0$ Jun12 asked Compound Poisson process with exponential distribution Apr23 answered Need help solving Recursive series defined by $x_1 = \sin x_0$ and $x_{n+1} = \sin x_n$ Apr14 asked Similarity between $I+N$ and $e^N$ when $N$ is nilpotent Oct17 asked How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? Sep25 asked Solution to a system of linear equations in GF(2)