Apparently, this user prefers to keep an air of mystery about them.
17 Exciting games and material to motivate children to math Oct 19 '11
14 Sum of derivatives of a polynomial Dec 4 '11
3 Minimizing maximum absolute column sum norm of the residual between a matrix and its $k$-rank approximation Oct 20 '12
0 $l_1$ distance of a point to a convex polygon Jun 9 '12