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 Oct 18 revised Proving that $U(n)\subset SO(2n)$ added 99 characters in body Jul 31 revised How following matrices equation is solved? math type Jun 19 revised Why are these curves' points called rational? added 2 characters in body 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 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 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 8 revised How to find $E[X^2]$ when computing the variance? added 6 characters in body Jun 6 revised how to know in which range $\cos^{2}\theta$ $\le$ $\sin^{2}\theta$? added 56 characters in body Jun 6 revised general term of a given sequence formated Jun 3 revised proving the Klein 4 group is abelian added 2 characters in body May 11 revised How to do this integral. added 606 characters in body Mar 30 revised circle as polar coordinates added 340 characters in body Jun 25 revised Geodesics of this metric added 164 characters in body Jun 5 revised Conformal transformation of curvature tensor added 447 characters in body Nov 11 revised Unitary matrix with all its eigenvalues equal to 1 must be the identity matrix added 227 characters in body Oct 1 revised Area under a point deleted 61 characters in body Aug 23 revised What's the meaning of $\dagger$ added 59 characters in body Aug 23 revised Proving $G\cong \Bbb{Z}_p$ if $|G|$ is prime. Latex added for clarity