Extremality of bounds for numerical radii of Foguel operators

DOI10.1016/j.jmaa.2023.127484OpenAlexW4379617477MaRDI QIDQ6115660

Hwa-Long Gau, Chi-Kwong Li, Pei Yuan Wu, Kuo-Zhong Wang

Publication date: 10 August 2023

Published in: Journal of Mathematical Analysis and Applications (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1016/j.jmaa.2023.127484

zbMATH Keywords

numerical rangenumerical radiusFoguel operator

Mathematics Subject Classification ID

Basic linear algebra (15Axx) Special classes of linear operators (47Bxx) General theory of linear operators (47Axx)

Cites Work

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• Numerical ranges of Foguel operators
• Approximate unitary equivalence of normaloid type operators
• Inner derivations and norm equality
• Numerical Ranges of Hilbert Space Operators
• Numerical range of the Foguel–Halmos operator
• On Foguel's Answer to Nagy's Question
• A Counterexample to a Problem of SZ.-Nagy

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