Apparently, this user prefers to keep an air of mystery about them.
2 Describing the intersection of two planes nov 1 '12
2 Which one of the following is true for all vectors $u$, $v$ and $w$ where $u\cdot v = 0$ and $u\cdot w = 0$? nov 1 '12
0 Which one of the following vectors in R^3 is a unit vector that is parallel to the plane with general equation 2x+2y+z=1? nov 1 '12