Weyl's theorem and tensor products: a counterexample.
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D. Kitson, R. Harte, C. Hernandez, Weyl's theorem and tensor products: a counterexample., Journal of Mathematical Analysis and Applications, 378, 1, 2011, 128 - 132
Abstract
Approximately fifty percent of Weyl's theorem fails to transfer from Hilbert space operators to their tensor product. As a biproduct we find that the product of circles in the complex plane is a limacon.
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Author's Homepage: http://people.tcd.ie/dkitson
Publisher: Elsevier
Type of material: Journal Article