PhD student at RWTH Aachen focussing on algebra (eg. group- and representation theory, lattices, number theory).
10 Are two subgroups that contain a common element conjugate iff they are conjugate under the normalizer? feb 29 '12
9 Showing determinants using trace in a 2x2 matrix nov 1 '11
5 Greatest elements in crystallographic root systems nov 17 '12
4 Let $K$ be a Sylow subgroup of a finite group $G$. Prove that if $x \in N(K)$ and the order of $x$ is a power of $p$, then $ x \in K$. apr 10 '14
4 Proving that $G/N$ is an abelian group dec 26 '11