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- W2472498156 abstract "Let H^2(D) denote the classical Hardy space of the open unit disk D in the complex plane. We obtain descriptions of both the spectrum and essential spectrum of composition operators on H^2(D) whose symbols belong to the class S(2) introduced by Kriete and Moorhouse [Trans. Amer. Math. Soc., 359, 2007]. Our work reveals new possibilities for the shapes of composition-operator spectra, settling a conjecture of Cowen's [J. Operator Th. 9, 1983]. Our results depend on a number of lemmas, perhaps of independent interest, that provide spectral characterizations of sums of elements of a unital algebra over a field when certain pairwise products of the summands are zero." @default.
- W2472498156 created "2016-07-22" @default.
- W2472498156 creator A5021306701 @default.
- W2472498156 date "2014-01-12" @default.
- W2472498156 modified "2023-09-27" @default.
- W2472498156 title "Spectra of Composition Operators with Symbols in S(2)" @default.
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