\(\varepsilon\)-pseudo weak-demicompactness for \(2 \times 2\) block operator matrices

DOI10.21494/iste.op.2024.1098MaRDI QIDQ6567348

Ines Chtourou, Bilel Krichen

Publication date: 4 July 2024

Published in: Advances in Pure and Applied Mathematics (Search for Journal in Brave)

zbMATH Keywords

demicompact linear operatoressential pseudo-spectrumpseudo-Fredholm perturbationunbounded \(2 \times 2\) block operator matrices

Mathematics Subject Classification ID

Spectrum, resolvent (47A10) Perturbation theory of linear operators (47A55) (Semi-) Fredholm operators; index theories (47A53) Operator matrices (47A08)

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