Remarks on the Convergence of Pseudospectra

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• 作者：Sabine B?gli ; Petr Siegl
• 关键词：47A10 ; 47A58 ; Pseudospectrum ; generalised norm resolvent convergence ; resolvent level sets
• 刊名：Integral Equations and Operator Theory
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：80
• 期：3
• 页码：303-321
• 全文大小：351 KB
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• 作者单位：Sabine B?gli (1)
  Petr Siegl (1)
  
  1. Mathematisches Institut, Universit?t Bern, Sidlerstrasse 5, 3012, Bern, Switzerland
  
• ISSN：1420-8989

文摘

We establish the convergence of pseudospectra in Hausdorff distance for closed operators acting in different Hilbert spaces and converging in the generalised norm resolvent sense. As an assumption, we exclude the case that the limiting operator has constant resolvent norm on an open set. We extend the class of operators for which it is known that the latter cannot happen by showing that if the resolvent norm is constant on an open set, then this constant is the global minimum. We present a number of examples exhibiting various resolvent norm behaviours and illustrating the applicability of this characterisation compared to known results.