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 Apr14 comment How to find the n-th derivative? @Bernard Your simplification can't be right. It doesn't work for $n=1$. Apr10 comment What is the mutual information $I(X;X)$? This answer is wrong. It should be unselected. The answer by @avitus is the right one. Apr5 awarded Popular Question Mar27 awarded Notable Question Mar20 revised $3\sigma^2 \le \mu(1-\mu)$ for unimodal probability distributions on $[0,1]$? added 273 characters in body Mar20 asked $3\sigma^2 \le \mu(1-\mu)$ for unimodal probability distributions on $[0,1]$? Feb18 comment A generalization of this type of mean to power > 2 @Macavity I think that $n,m$ generalization merits inclusion into an answer. Feb13 comment shadow price in linear programming Where can I find a more mathematical explanation of this (I am a physicist, so by mathematical I don't mean too abstract)? Jan22 comment Why can a circle be described by an equation but not by a function? @sashoalm Yes, and that function is called the indicator function for the set of pairs $(x,y)$ that satisfy the relation. Dec15 awarded Caucus Dec12 comment What is the name of this letter? This is question fits better on tex.stackexchange.com. Nov21 accepted Minimum dimension to hold $N$ points with given distances? Nov21 revised How to determine if a vector belongs to the conical hull of a set of vectors? edited title Nov10 comment How to determine if a vector belongs to the conical hull of a set of vectors? @p.s. Can you give more details please? Nov7 comment How to determine if a vector belongs to the conical hull of a set of vectors? @John $0\le \alpha_i < \infty$. Yes, the infinite cone. Nov7 asked How to determine if a vector belongs to the conical hull of a set of vectors? Oct31 asked Minimum dimension to hold $N$ points with given distances? Oct20 comment Is the set of all invertible $n \times n$ matrices a vector space? @JacquesUng You should accept this answer. Oct17 comment The Wicked Integral I think it is very unintuitive that this is independent of $n$. It would be nice if someone offered an intuitive explanation of that fact. Oct9 comment Creative way to solve a linear system