Some numerical characteristics of direct sum of operators

DOI10.31801/cfsuasmas.655136zbMath1493.47006OpenAlexW3081002720MaRDI QIDQ5083493

E. Otkun Çevik

Publication date: 20 June 2022

Published in: Communications Faculty Of Science University of Ankara Series A1Mathematics and Statistics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.31801/cfsuasmas.655136

zbMATH Keywords

numerical rangesectorial operatornumerical radiusCrawford numberdirect sum of operators

Mathematics Subject Classification ID

Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product) (46C05) Numerical range, numerical radius (47A12) Linear accretive operators, dissipative operators, etc. (47B44) Sectorial operators (47B12)

Related Items (3)

Gaps between some spectral characteristics of direct sum of Hilbert space operators ⋮ Some gap relations between operator norm with spectral and numerical radii of direct sum Hilbert space operators ⋮ Spectra of composition operators on the Dirichlet space induced by full-maps of the disk

Cites Work

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• Symmetric operators and nonclassical spectral problems
• On the numerical radius and its applications
• Multipoint normal differential operators of first order

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