The boundary of the numerical range

DOI10.1017/S001708950000447XzbMath0452.47004OpenAlexW1980921871MaRDI QIDQ3899027

G. de Barra

Publication date: 1981

Published in: Glasgow Mathematical Journal (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1017/s001708950000447x

zbMATH Keywords

point spectrumhyponormal operatorsemi-normal operator

Mathematics Subject Classification ID

Spectrum, resolvent (47A10) Subnormal operators, hyponormal operators, etc. (47B20)

Cites Work

• Hyponormal operators
• Extreme points of the numerical range of a hyponormal operator
• The numerical range of an operator
• A Condition that a Normal Operator have a Closed Numerical Range
• On the Spectra of Semi-Normal Operators
• On Extreme Points of the Numerical Range of Normal Operators
• On the Numerical Range of Compact Operators on Hilbert Spaces

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