Abstract
Property (R) holds for a bounded linear operator \({T \in L(X)}\), defined on a complex infinite dimensional Banach space X, if the isolated points of the spectrum of T which are eigenvalues of finite multiplicity are exactly those points λ of the approximate point spectrum for which λI − T is upper semi-Browder. In this paper we consider the permanence of this property under quasi nilpotent, Riesz, or algebraic perturbations commuting with T.
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Aiena, P., Aponte, E., Guillén, J.R. et al. Property (R) under Perturbations. Mediterr. J. Math. 10, 367–382 (2013). https://doi.org/10.1007/s00009-012-0174-8
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DOI: https://doi.org/10.1007/s00009-012-0174-8