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Diagonals of Self-adjoint Operators with Finite Spectrum

Marcin BownikJohn Jasper — 2015

Bulletin of the Polish Academy of Sciences. Mathematics

Given a finite set X⊆ ℝ we characterize the diagonals of self-adjoint operators with spectrum X. Our result extends the Schur-Horn theorem from a finite-dimensional setting to an infinite-dimensional Hilbert space analogous to Kadison's theorem for orthogonal projections (2002) and the second author's result for operators with three-point spectrum (2013).

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