Bouazza S.
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 Oct 29 awarded Yearling Nov 16 comment Prove that P(x)=x And the fact that the $f^k\left( 0 \right)$ are pairwise distinct. Nov 16 awarded Commentator Nov 16 comment Fastest way to solve these kinds of fractions (equal to zero and have two variables)? You should also exclude the points where your fraction isn't well defined, those points satisfy which equation ? Nov 15 comment Show that $x \mapsto \left( x^{\top} \sigma x , -\mu^{\top}x \right)^{\top}$ transforms a given set into a convex set. Thank you for the counter-example ! Unfortunately there are no additional constraints assumed and that means that they made a mistake :( Nov 15 accepted Show that $x \mapsto \left( x^{\top} \sigma x , -\mu^{\top}x \right)^{\top}$ transforms a given set into a convex set. Nov 15 comment Show that $x \mapsto \left( x^{\top} \sigma x , -\mu^{\top}x \right)^{\top}$ transforms a given set into a convex set. Yes thank you, I fixed that. Nov 15 revised Show that $x \mapsto \left( x^{\top} \sigma x , -\mu^{\top}x \right)^{\top}$ transforms a given set into a convex set. added 2 characters in body Nov 15 answered How does $\sum_{n = 1}^{\infty} \frac{1}{n(n+1)}$ simplify? Nov 15 asked Show that $x \mapsto \left( x^{\top} \sigma x , -\mu^{\top}x \right)^{\top}$ transforms a given set into a convex set. Sep 24 awarded Autobiographer May 21 asked Problems about symmetric groups Jul 13 comment Locus and concurrent lines Now I understand, I completely ignored the rectangle thing that I just continued squaring until getting a hyperbola-like equation ( which in fact is not, I reverified this morning ). Thank you both user6312 and Jyrki Lahtonen ! Jul 12 awarded Scholar Jul 12 accepted Locus and concurrent lines Jul 12 comment Locus and concurrent lines Thank you for the hint ! Unless I'm mistaken, if the lines aren't orthogonal we get a conic section ( an hyperbola to be precise ). Jul 12 awarded Student Jul 12 asked Locus and concurrent lines Jul 11 comment Proof that $\sum\limits_{k=1}^nk^2 = \frac{n(n+1)(2n+1)}{6}$? I waited in order to gain the commenting privilege just to say this : You made me fall in love with calculus again !! Jul 10 comment Trigonometry: Solve $(1-\cos\alpha)^2 + \sin^2\alpha = d^2$ for $\alpha$ Guess I was nearly one minute late ^_^