Answer score of 10 or more. This badge can be awarded multiple times.
earned this badge 3 times
If $N$ and $M$ are normal subgroups and $N$ and $M$ have no common element other than $e$ then prove that for all $m \in M$ and $n\in N$, $mn=nm$.
Awarded feb 23 '13 at 16:21
Awarded feb 13 '13 at 18:02
Awarded jan 1 '13 at 0:41