Approximation by Fredholm operators in the metric space of closed operators
L. A. Coburn, A. Lebow (1966)
Rendiconti del Seminario Matematico della Università di Padova
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L. A. Coburn, A. Lebow (1966)
Rendiconti del Seminario Matematico della Università di Padova
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Živković, Snežana (1997)
Publications de l'Institut Mathématique. Nouvelle Série
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Miroslav Sova (1982)
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Manuel González, Antonio Martinón (1990)
Extracta Mathematicae
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Abdelmoumen, Boulbeba, Baklouti, Hamadi (2009)
Journal of Inequalities and Applications [electronic only]
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Chun Guang Li, Ting Ting Zhou (2014)
Studia Mathematica
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A bounded linear operator T acting on a Hilbert space is said to be polaroid if each isolated point in the spectrum is a pole of the resolvent of T. There are several generalizations of the polaroid property. We investigate compact perturbations of polaroid type operators. We prove that, given an operator T and ε > 0, there exists a compact operator K with ||K|| < ε such that T + K is polaroid. Moreover, we characterize those operators for which a certain polaroid type property...
Kim, An-Hyun, Kim, In Hyoun (2006)
Journal of Inequalities and Applications [electronic only]
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D. Przeworska-Rolewicz (1977)
Annales Polonici Mathematici
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