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A-Browder’s Theorem and Generalized a-Weyl’s Theorem

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Abstract

Two variants of the essential approximate point spectrum are discussed. We find for example that if one of them coincides with the left Drazin spectrum then the generalized a-Weyl’s theorem holds, and conversely for a-isoloid operators. We also study the generalized a-Weyl’s theorem for Class A operators.

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  1. College of Mathematics and Information Science, Shaanxi Normal University, Xi’an 710062, P. R. China

    Xiao Hong Cao

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  1. Xiao Hong Cao
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Cao, X.H. A-Browder’s Theorem and Generalized a-Weyl’s Theorem. Acta Math Sinica 23, 951–960 (2007). https://doi.org/10.1007/s10114-005-0870-4

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  • DOI: https://doi.org/10.1007/s10114-005-0870-4

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