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 Jun 17 comment Proposed proof of topological result What's $(B,d)$ and $(A,d)$? Jun 17 reviewed Approve Proposed proof of topological result Jun 17 answered How to factor $ax^{2}+bxy+cy^{2},\,a\neq 0$? Jun 17 revised $(x x^T)^{-1}$, efficient matrix inversion for matrix composed as product of a vector with itself? edited a wrong order of factor in the first denominator of the second formula Jun 12 answered what will be the parameterization of cone Jun 12 comment Solutions for $|x^2-5x+2|=4$ @BetterWorld That means they should also come as a solution when you consider the negative sign of the modulus, try it. You should discard those solutions when you get the from the positive values, and when consider the negative, $x=1$ should come out again. Jun 12 comment Solutions for $|x^2-5x+2|=4$ @BetterWorld That just means they're not solutions, because they fail to satisfy the hypothesis that $x^2-x-1$ is positive, on which the solution depends. Jun 12 reviewed Approve Limit of $\large{\frac{1}{2^x}}$ as $x \to \infty$ Jun 12 comment Solutions for $|x^2-5x+2|=4$ You're very welcome! :) No need for sirs. Jun 12 answered Solutions for $|x^2-5x+2|=4$ Jun 11 revised Choosing $8$ shoes from $20$ different pairs of shoes to get at least two pairs edited body Jun 11 revised Choosing $8$ shoes from $20$ different pairs of shoes to get at least two pairs added 85 characters in body Jun 11 comment Choosing $8$ shoes from $20$ different pairs of shoes to get at least two pairs @Dargenn My result is $p=0.43$, and so the solution would be $0.57$. Jun 11 comment Choosing $8$ shoes from $20$ different pairs of shoes to get at least two pairs @Dargenn I'm sorry, $P$ should be $P=40\cdot39\cdot38\cdot\ldots\cdot33$, and this solution considers a different case the same set of shoes dissordered, so it's incomplete. You can divide by the number of permutations of the $8$ chosen shoes. Jun 11 answered Choosing $8$ shoes from $20$ different pairs of shoes to get at least two pairs Jun 10 comment What is the limit of the below functions when n tends to inifinity? First of all, welcome. Second, you shouldn't expect anyone here to do this for you. You must first expose what you know, what you have tried, and the problems you have doing these. Third, always try to format mathematical expressions, I did for you, please see the code to see how. Jun 10 revised What is the limit of the below functions when n tends to inifinity? LaTeX formating Jun 10 revised The most efficient way to find a minimal value in a 2 dimensional matrix. added 137 characters in body Jun 10 comment The most efficient way to find a minimal value in a 2 dimensional matrix. @user3697176 I will add that. Jun 10 answered The most efficient way to find a minimal value in a 2 dimensional matrix.