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The stability radius of a quasi-Fredholm operator |
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| Authors: | Pak Wai Poon |
| Institution: | Department of Mathematics, University of Melbourne, Victoria, 3052, Australia |
| Abstract: | We extend the technique used by Kordula and Müller to show that the stability radius of a quasi-Fredholm operator  is the limit of  as  . If  is an isolated point of the Apostol spectrum  , then the above limit is non-zero if and only if  is quasi-Fredholm. |
| Keywords: | Stability radius Apostol spectrum semi-regular quasi-Fredholm operators ascent descent |
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