Apparently, this user prefers to keep an air of mystery about them.
3 when do two elements of SO3 commute? dec 28 '12
1 Let $K$ be a normal subgroup of order 2 in group $G$, show that $K$ lies in the centre of $G$ dec 30 '12
0 For each integer $k\geq 3$, give an example of a finite group $G$ and a subgroup $H$ such that $|G|=k|H|$ and $H$ is not normal in $G$ dec 30 '12