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On the spectra of $C_ {11}$-contractions

Authors: H. Bercovici and L. Kérchy
Journal: Proc. Amer. Math. Soc. 95 (1985), 412-418
MSC: Primary 47A20; Secondary 47A10, 47A45
MathSciNet review: 806079
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Abstract: We give a complete characterization of the closed subsets of the complex plane that can serve as spectra of completely nonunitary contractions of class ${C_{11}}$.

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Article copyright: © Copyright 1985 American Mathematical Society