I'm interested primarily in the spectral theory of Jacobi, Schrödinger and CMV operators.
4 Jacobian has small eigenvalues everywhere in an open set. Does this imply globally attracting fixed point in that set? Jul 3 '14
4 Is there an easy way to tell if all eigenvalues of a unitary or self-adjoint matrix only have eigenvalues of multiplicity two? Aug 21 '14
2 Maximal sets of algebraic curves, closed under rotation, dilation, and translation, that pairwise intersect at most twice Jan 26 '12
1 Norm related to diophantine approximation? Jan 23 '12