Pseudospectra do not determine norm behavior, even for matrices with only simple eigenvalues |
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| Authors: | Thomas Ransford,Jé ré mie Rostand |
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| Affiliation: | Département de mathématiques et de statistique, Université Laval, Québec, QC, Canada G1V 0A6 |
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| Abstract: | We present an example of a pair of 4×4 matrices having identical pseudospectra but whose squares have different norms. The novelty of the example lies in the fact that the matrices in question have only simple eigenvalues. |
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| Keywords: | 15A18 |
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