On the instability of non-semi-Fredholm closed operators under compact perturbations with applications to ordinary differential operators

DOI10.1017/S0308210500026706zbMath0663.47013MaRDI QIDQ3812810

Louis E. Labuschagne

Publication date: 1988

Published in: Proceedings of the Royal Society of Edinburgh: Section A Mathematics (Search for Journal in Brave)

zbMATH Keywords

ordinary differential operatorsstability of several subclasses of the non-semi-Fredholm closed operators under compact perturbations

Mathematics Subject Classification ID

Riesz operators; eigenvalue distributions; approximation numbers, (s)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators (47B06) Perturbation theory of linear operators (47A55) General theory of ordinary differential operators (47E05) (Semi-) Fredholm operators; index theories (47A53) Boundary value problems for ordinary differential equations (34B99)

Related Items

The gap between subspaces and perturbation of non-semi-Fredholm operators ⋮ Applications of the minimum modulus function in operator algebras

Cites Work

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• On the instability of non-semi-Fredholm operators under compact perturbations
• The instability of non-semi-Fredholm operators under compact perturbations
• Note on a theorem of Murray

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