Apparently, this user prefers to keep an air of mystery about them.
4 How to prove this function is concave? Jun 22 '11
4 How to calculate $\langle v,w\rangle$ based only on $\langle v,x_i\rangle$ and $\langle w,x_i\rangle$? Apr 26
2 How to prove that this sequence converges? Feb 17 '11