Živković, Snežana Semi-Fredholm operators and perturbations. (English) Zbl 0889.47003 Publ. Inst. Math., Nouv. Sér. 61(75), 73-89 (1997). The main result in this paper is a general perturbation theorem for semi-Fredholm operators. Then as corollaries the author gets some well known results. Especially valuable are the many examples and their applications in the perturbation theory of semi-Fredholm (Fredholm) operators. This paper will be helpful to everyone working in the theory of semi-Fredholm operators. Reviewer: Vladimir Rakočević (Niš) Cited in 3 Documents MSC: 47A10 Spectrum, resolvent 47A53 (Semi-) Fredholm operators; index theories 47A55 Perturbation theory of linear operators Keywords:semi-Fredholm operators; perturbation theorem PDF BibTeX XML Cite \textit{S. Živković}, Publ. Inst. Math., Nouv. Sér. 61(75), 73--89 (1997; Zbl 0889.47003) OpenURL