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age 22
visits member for 3 years, 5 months
seen Nov 17 at 19:58

Just someone who loves maths.


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 ^_^
Jul
10
answered Trigonometry: Solve $(1-\cos\alpha)^2 + \sin^2\alpha = d^2$ for $\alpha$