Approximation of the quadratic numerical range of block operator matrices

DOI10.1007/s00020-012-1971-yzbMath1277.47009OpenAlexW1973119620MaRDI QIDQ1946544

Ahmed Muhammad, Marco Marlettta

Publication date: 15 April 2013

Published in: Integral Equations and Operator Theory (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1007/s00020-012-1971-y

zbMATH Keywords

projection methodblock operator matrixquadratic numerical rangespectral pollutionHain-Lüst operator

Mathematics Subject Classification ID

Norms of matrices, numerical range, applications of functional analysis to matrix theory (15A60) Numerical range, numerical radius (47A12)

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Cites Work

• Spectral inclusion for unbounded block operator matrices
• The Block Numerical Range of an n × n Block Operator Matrix
• Spectral pollution
• A new concept for block operator matrices: The quadratic numerical range
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