On some theorems of Berberian and Sheth

DOI10.3792/pja/1195520197zbMath0227.47001OpenAlexW2023770458MaRDI QIDQ5634482

Takayuki Furuta, Ritsuo Nakamoto

Publication date: 1970

Published in: Proceedings of the Japan Academy, Series A, Mathematical Sciences (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.3792/pja/1195520197

Mathematics Subject Classification ID

Spectrum, resolvent (47A10) Numerical range, numerical radius (47A12) General (adjoints, conjugates, products, inverses, domains, ranges, etc.) (47A05)

Related Items

On the numerical range of an operator, On a theorem of Bouldin, On normal approximate spectrum, III

Cites Work

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• The numerical range of a normal operator
• On the spectrum of a hyponormal operator
• Remark on a paper of S.K. Berberian
• Spectra of products and numerical ranges
• An extension of Weyl's theorem to a class of not necessarily normal operators
• Hyponormal operators and spectral density
• On Hyponormal Operators