On the measure of non strict cosingularity and the theory of operator matrix

DOI10.4134/CKMS.C230344MaRDI QIDQ6638247

Ines Walha, Naila Bouida

Publication date: 14 November 2024

Published in: Communications of the Korean Mathematical Society (Search for Journal in Brave)

zbMATH Keywords

essential spectraoperators theorymeasure of non strict cosingularitytheory of Fredholm operatorstheory of operator matrices

Mathematics Subject Classification ID

Several-variable operator theory (spectral, Fredholm, etc.) (47A13) Spectrum, resolvent (47A10) Perturbation theory of linear operators (47A55) Functions whose values are linear operators (operator- and matrix-valued functions, etc., including analytic and meromorphic ones) (47A56) (Semi-) Fredholm operators; index theories (47A53)

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