The regular spectrum of upper triangular closed operator matrices

DOI10.1007/S00009-023-02308-2OpenAlexW4318617056MaRDI QIDQ2687587

Qingmei Bai, Alatancang Chen

Publication date: 7 March 2023

Published in: Mediterranean Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1007/s00009-023-02308-2

zbMATH Keywords

closed operatorcompletion problemregular spectrumupper triangular operator matrix

Mathematics Subject Classification ID

Perturbation theory of linear operators (47A55) Spectral sets of linear operators (47A25)

Cites Work

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• Completions of upper-triangular matrices to Kato nonsingularity
• On the perturbations of spectra of upper triangular operator matrices
• Closedness of ranges of upper-triangular operators
• Generalized inverses. Theory and applications.
• Ascent, descent, nullity and defect, a note on a paper by A.E. Taylor
• Operators with finite ascent and descent
• Spectra of 2×2 upper triangular operator matrices with unbounded entries

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