Apparently, this user prefers to keep an air of mystery about them.
4 Given a real valued $C^1$ function $f$, show there exists a continuous vector-valued function $F$ with $f(X) = X \cdot F(X)$ Jan 9 '13
3 Partial derivatives of an interesting function. Jan 14 '13
0 Justification of taking limit under an integral Jan 16 '13