Apparently, this user prefers to keep an air of mystery about them.
3 Show $(W_1 + W_2 )^\perp = W_1^\perp \cap W_2^\perp$ and $W_1^\perp + W_2^\perp ⊆ (W_1 \cap W_2 )^\perp$ Nov 29 '12
2 Find a matrix that diagonalizes Dec 5 '12
2 How to solve $\int\tan^3(x)\,dx$? Feb 2 '11