The Schur-Horn theorem for operators with three point spectrum

Published 8 Oct 2010 in math.FA | (1010.1786v2)

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.

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John Jasper

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