Abstract
As shown by Mbekhta [9] and [10], the analytic core and the quasi-nilpotent part of an operator play a significant role in the local spectral and Fredholm theory of operators on Banach spaces. It is a basic fact that the analytic core is closed whenever 0 is an isolated point of the spectrum. In this note, we explore the extent to which the converse is true, based on the concept of support points. Our results are exemplified in the case of decomposable operators, Riesz operators, convolution operators, and semi-shifts.
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Miller, T.L., Miller, V.G. & Neumann, M.M. On operators with closed analytic core. Rend. Circ. Mat. Palermo 51, 495–502 (2002). https://doi.org/10.1007/BF02871857
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DOI: https://doi.org/10.1007/BF02871857