Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Schur-Horn theorem for operators with three point spectrum   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.

27
The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc