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Weyl's theorem and tensor products: A counterexample |
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| Authors: | Derek Kitson Carlos Hernández |
| Institution: | a School of Mathematics, Trinity College, Dublin, Ireland b Instituto de Matemáticas, Universidad Nacional Autónoma de México, Mexico |
| 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 limaçon. |
| Keywords: | Weyl's theorem Browder's theorem Tensor product Shifts Spectral picture Limaç on |
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