Apparently, this user prefers to keep an air of mystery about them.
3 Finding partial derivatives for equations expressed in terms of $z$ where $z=f(x,y)$ to find tangent plane may 16 '13
1 Do we consider complex values for eigenvalues dec 9 '12
1 Solve for eigenvector (complex eigenvalue) dec 10 '12
0 Finding the limit for functions with two variables may 16 '13