Apparently, this user prefers to keep an air of mystery about them.
10 Tetrahedron inside a sphere Nov 28 '10
7 Height of a tetrahedron Nov 20 '10
5 How to prove that a torus has the same volume as a cylinder (with the height equal to the torus' perimeter) Nov 24 '10
2 Fewest inequalities to define a hollow cube Feb 6 '11