Essential spectra of quasisimilar -quasihyponormal operators.

Kim, An-Hyun; Kim, In Hyoun

Displaying similar documents to “Essential spectra of quasisimilar $(p, k)$ -quasihyponormal operators.”

Perturbation of a Fredholm complex by inessential operators.

Gleason, Jim (2001)

Georgian Mathematical Journal

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Perturbations of Fredholm operators

Robert Israel (1974)

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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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An Atkinson-type theorem for B-Fredholm operators

M. Berkani, M. Sarih (2001)

Studia Mathematica

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Let X be a Banach space and let T be a bounded linear operator acting on X. Atkinson's well known theorem says that T is a Fredholm operator if and only if its projection in the algebra L(X)/F₀(X) is invertible, where F₀(X) is the ideal of finite rank operators in the algebra L(X) of bounded linear operators acting on X. In the main result of this paper we establish an Atkinson-type theorem for B-Fredholm operators. More precisely we prove that T is a B-Fredholm operator if and only...

Perturbation results on semi-Fredholm operators and applications.

Abdelmoumen, Boulbeba, Baklouti, Hamadi (2009)

Journal of Inequalities and Applications [electronic only]

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Semi-Fredholm operators and perturbations.

Živković, Snežana (1997)

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Hereditarily normaloid operators.

Bhagwati Prashad Duggal (2005)

Extracta Mathematicae

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A Banach space operator T belonging to B(X) is said to be hereditarily normaloid, T ∈ HN, if every part of T is normaloid; T ∈ HN is totally hereditarily normaloid, T ∈ THN, if every invertible part of T is also normaloid; and T ∈ CHN if either T ∈ THN or T - λI is in HN for every complex number λ. Class CHN is large; it contains a number of the commonly considered classes of operators. We study operators T ∈ CHN, and prove that the Riesz projection associated with a λ ∈ isoσ(T), T ∈...