Apparently, this user prefers to keep an air of mystery about them.
50 Why can't you square both sides of an equation? Nov 16 '13
12 Pythagorean Theorem Proof Without Words 6 Jan 30 '12
6 Where does the proof of $\sqrt 2$ is irrational break down when trying to prove the same for $\sqrt 4$? Apr 25 '15