The Schur-Horn theorem for operators with three point spectrum
Functional Analysis
2013-09-16 v2
Abstract
We characterize the set of diagonals of the unitary orbit of a self-adjoint operator with three points in the spectrum. Our result gives a Schur-Horn theorem for operators with three point spectrum analogous to Kadison's result for orthogonal projections.
Cite
@article{arxiv.1010.1786,
title = {The Schur-Horn theorem for operators with three point spectrum},
author = {John Jasper},
journal= {arXiv preprint arXiv:1010.1786},
year = {2013}
}