Which Approximate Eigenvalues Are Contained in the Essential Numerical Range? Approximately Normal Eigenvalues of Unbounded Operators in Hilbert and Banach Spaces

Integral Equations and Operator Theory 2026

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Authors: Nicolas Hefti
DOI: 10.1007/s00020-025-02820-y
Cited by: 0
References: 40

Fields of Study & Subjects

Spectral Theory in Mathematical Physics Advanced Banach Space Theory Holomorphic and Operator Theory

Publication details

Journal / source
Integral Equations and Operator Theory
Volume
98
Issue
1
Publication date
18 February 2026
Language
EN