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 Apr 26 comment Derivative of $\operatorname{tr}[(CC^{T})^{-1}]$? I think @William might be confused because there are different conventions on matrix derivatives. You want to be consistent with the Matrix cookbook. Feb 21 revised Vector lengths: How to prove this inequality? missing square Feb 21 suggested approved edit on Vector lengths: How to prove this inequality? Feb 13 comment How to solve $\text{covariance}(X,Y)$ if $Y=X^2$? $XX^2 = X^3$ is correct... Feb 9 awarded Yearling Nov 19 comment Can anyone please explain the the difference between a vector and a matrix? vector is a skinny matrix. Nov 6 comment My proof of Birkhoffâ€“von Neumann theorem whit a probabilistic point of view Welcome to SE! What is the question? (SE is not a blog) Oct 22 answered How to represent this matlab code in mathematical notation? Oct 19 revised Proving $\Gamma (\frac{1}{2}) = \sqrt{\pi}$ added 87 characters in body Oct 19 answered Proving $\Gamma (\frac{1}{2}) = \sqrt{\pi}$ Jul 22 awarded Enlightened Jul 22 awarded Nice Answer Jul 13 comment How does kernel work work probably more suitable for stats.stackexchange.com (cross validated) Jul 5 answered Clarifying Derivation of Entropy Jul 4 revised Is there a difference between these statements about natural numbers? adding appropriate tag Jul 4 answered Why does this expectation integrate to 1 Jul 4 suggested approved edit on Is there a difference between these statements about natural numbers? Jul 4 comment Is there a difference between these statements about natural numbers? quantifier scope is different. You can replace the second $x$ in the first statement to $y$ and think about it. Jun 22 awarded Popular Question May 7 comment what does function from a set to its power set mean? what's the difference between your notation of --->, -->, and ->?