Sasha
Reputation
54,210
90/100 score
 Apr 7 asked Relationship between eigenvectors of correlation and covariance matrices Apr 2 awarded Nice Answer Mar 29 awarded Nice Answer Mar 25 comment Simplify Legendre Polynomial times a power Please define simplify. Mar 25 answered Rotation of a matrix Mar 18 awarded Enlightened Mar 18 awarded Nice Answer Mar 17 awarded Nice Answer Mar 16 revised How to solve a quartic equation? edited body Mar 14 revised Prove that the matrix $(I-A)$ is invertible with $\| (I-A)^{-1} \| \le \frac{1}{1-a}$. edited title Feb 18 awarded Enlightened Feb 18 awarded Nice Answer Jan 27 comment cumulants and infinite divisibility @A.S. Thank you. I have applied the correction. Jan 27 revised cumulants and infinite divisibility added 12 characters in body Jan 24 answered Integral $\int_0^{\pi/2} \sin(ax)\cos(x)\,dx$ Jan 21 comment Oscillatory integral giving me the willies @Brightsun thanks for that. Adjusted Jan 21 revised Oscillatory integral giving me the willies added 44 characters in body; added 1 character in body Jan 11 revised Proof convexity of Logarithmic function added 10 characters in body Jan 11 comment Proof convexity of Logarithmic function $f(t)$ is twice differentiable for $t > 0$, so you could check the appropriate criterion, but I am afraid it is concave, rather than convex. Dec 18 awarded Enlightened