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The Schur-Horn problem for normal operators (2015)

Kennedy, M., Skoufranis, P.

Oxford University Press

In: Proceedings of the London Mathematical Society

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Publication Date: 2015-08-05

Description: We consider the Schur–Horn problem for normal operators in von Neumann algebras, which is the problem of characterizing the possible diagonal values of a given normal operator based on its spectral data. For normal matrices, this problem is well known to be extremely difficult, and in fact, it remains open for matrices of size greater than $3$ . We show that the infinite-dimensional version of this problem is more tractable, and establish approximate solutions for normal operators in von Neumann factors of type I $_\infty$ , II, and III. A key result is an approximation theorem that can be seen as an approximate multivariate analogue of Kadison's Carpenter Theorem.

Print ISSN: 0024-6115

Electronic ISSN: 1460-244X

Topics: Mathematics

Published by Oxford University Press

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