On the spectra of 𝐶₁₁-contractions

Bercovici, H.; Kérchy, L.

doi:10.1090/S0002-9939-1985-0806079-9

On the spectra of $C_ {11}$-contractions
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by H. Bercovici and L. Kérchy PDF

Proc. Amer. Math. Soc. 95 (1985), 412-418 Request permission

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 ${C_{11}}$.

References

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Harmonic analysis of operators on Hilbert space