Apparently, this user prefers to keep an air of mystery about them.
8 Simplify K!/(K+1)! Mar 9
3 Intuition for a ring homomorphism? Aug 30 '15
2 Showing that a subnormal series for a finite group $G$ can be made into a composition series for $G$ May 30
2 An approximation of an integral Jan 8 '11