The essential spectrums of \(2\times 2\) unbounded anti-triangular operator matrices

DOI10.1007/S43034-024-00337-WMaRDI QIDQ6131804

Xinran Liu, De Yu Wu

Publication date: 18 April 2024

Published in: Annals of Functional Analysis (Search for Journal in Brave)

zbMATH Keywords

Fredholm operatorsSchechter essential spectrumKato essential spectrumGustafson essential spectrumWeidmann essential spectrumwolf essential spectrum

Mathematics Subject Classification ID

Linear operators defined by compactness properties (47B07) Perturbation theory of linear operators (47A55) (Semi-) Fredholm operators; index theories (47A53)

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