Apparently, this user prefers to keep an air of mystery about them.
18 Steinhaus theorem (sums version) Nov 28 '11
8 function that is its own inverse Aug 22 '11
6 If an Abelian group $G$ has order $n$ and at most one subgroup of order $d$ for all $d$ dividing $n$ then $G$ is cyclic Dec 22 '11
5 How to prove the implicit function theorem fails Jun 21 '11