A general version of Neubauer’s lemma and closed range almost closed operators

DOI10.1142/S1793557120501247zbMath1473.46035OpenAlexW2944759563WikidataQ124848501 ScholiaQ124848501MaRDI QIDQ4985559

Bekkai Messirdi, Sanaa Messirdi, Abdellah Gherbi

Publication date: 23 April 2021

Published in: Asian-European Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1142/s1793557120501247

zbMATH Keywords

closed rangealmost closed operatorsalmost closed subspacesNeubauer's lemma

Mathematics Subject Classification ID

General (adjoints, conjugates, products, inverses, domains, ranges, etc.) (47A05) Hilbert subspaces (= operator ranges); complementation (Aronszajn, de Branges, etc.) (46C07)

Cites Work

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• A metric for unbounded linear operators in a Hilbert space
• Some properties of unbounded operators with closed range
• Les opérateurs quasi Fredholm: Une généralisation des opérateurs semi Fredholm
• On operator ranges
• Semiclosed Operators in Hilbert Space
• On different concepts of closedness of linear operators

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