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 Dec8 awarded Caucus Sep30 awarded Explainer Jan19 awarded Yearling Jun26 asked Weyl group of a restricted root system Mar16 awarded Revival Jan19 awarded Yearling Sep1 comment Siegel's theorem I'm not sure what means the case $n\to\infty$. However, I don't know more references. Aug28 comment Siegel's theorem See Cassels' book (Rational quadratic forms) in the appendix, and Kitaoka's book (Arithmetic of quadratic forms) in Section 6.8. Aug25 revised Pullback of differential form on the double covering improved formatting Aug25 suggested approved edit on Pullback of differential form on the double covering Aug25 revised about the differentiability : the general case added 140 characters in body Aug25 answered about the differentiability : the general case Aug25 comment about the differentiability : the general case The definition of differentiable functions is not correct. The mistake is in the hypothesis "if the partial derivatives of f existi at $x_0$". See en.wikipedia.org/wiki/Differentiable_function Aug25 comment about the differentiability : the general case The elements $f(a,b)$ and $f(a_0,b_0)$ are already vectors. Mar8 answered If A is a finite abelian p-group, then Aut(A) acts transitively on the elements of highest order. Mar6 answered Unions and intersections of algebraic varieties Feb1 comment Image of a map in the complex plane Try to find out the image of the vertical lines $\{(x_0,y) : y>0\}$ for each $x_0\in(-\pi/2,\pi/2)$. I remember something nice was obtained. Jan31 comment Simplify _Elementary Calculus_ section 1.6 problem 25 (incorrect transcription) What is the meaning of $st(c)=7$? Jan30 comment Harmonic conjugate Maybe the problem is to find an analytic function $F(z)$ with real part $g(z)=g(x,y)$, with an other condition like $F(0)=g(0)$. However, you should rewrite it if you want an answer. Jan30 comment Sum of n squares $(x_1^2+x_2^2 + \dots + x_n^2)^2 (y_1^2+y_2^2 + \dots + y_n^2) = z_1^2+z_2^2 + \dots + z_n^2$ Is there a square wrong on $x_1^2+\dots+x_5^2$ in the title and the first equation?