On location of spectra of unbounded operators in the right half-plane

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1 Scopus citations

Abstract

Let T and T~ be closed linear operators in a Hilbert space. Let the spectrum of T is in the right half-plane. We suggest the conditions, under which the spectrum of T~ also lies in the right half-plane.

Original languageEnglish
Pages (from-to)1121-1127
Number of pages7
JournalAfrika Matematika
Volume31
Issue number7-8
DOIs
StatePublished - 1 Nov 2020

Keywords

  • Hilbert space
  • spectrum perturbation
  • unbounded operators

ASJC Scopus subject areas

  • Mathematics (all)

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