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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)

 
 

 

Boundaries of the spectra in $\mathcal {L}(X)$


Author: Woo Young Lee
Journal: Proc. Amer. Math. Soc. 116 (1992), 185-189
MSC: Primary 47A10; Secondary 47A53
DOI: https://doi.org/10.1090/S0002-9939-1992-1094504-4
MathSciNet review: 1094504
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Abstract: Suppose $T$ is a bounded linear operator on a complex Banach space $X$. If $T$ is "regular" with some finite dimensional intersection property and if 0 is in the boundary of the spectrum of $T$ then 0 is an isolated point of it.


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Keywords: Regular operator, punctured neighborhood theorem, spectrum, essential spectrum, Weyl spectrum
Article copyright: © Copyright 1992 American Mathematical Society