The Banach algebra generated by a contraction
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- by H. S. Mustafayev PDF
- Proc. Amer. Math. Soc. 134 (2006), 2677-2683 Request permission
Abstract:
Let $T$ be a contraction on a Banach space and $A_{T}$ the Banach algebra generated by $T$. Let $\sigma _{u}(T)$ be the unitary spectrum (i.e., the intersection of $\sigma (T)$ with the unit circle) of $T$. We prove the following theorem of Katznelson-Tzafriri type: If $\sigma _{u}(T)$ is at most countable, then the Gelfand transform of $R\in A_{T}$ vanishes on $\sigma _{u}(T)$ if and only if $\lim _{n\rightarrow \infty }\left \Vert T^{n}R\right \Vert =0.$References
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Additional Information
- H. S. Mustafayev
- Affiliation: Department of Mathematics, Faculty of Arts and Sciences, Yüzüncü Yil University, 65080, Van, Turkey
- Email: hsmustafayev@yahoo.com
- Received by editor(s): February 25, 2005
- Received by editor(s) in revised form: April 5, 2005
- Published electronically: March 23, 2006
- Communicated by: Joseph A. Ball
- © Copyright 2006
American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication. - Journal: Proc. Amer. Math. Soc. 134 (2006), 2677-2683
- MSC (2000): Primary 47Axx
- DOI: https://doi.org/10.1090/S0002-9939-06-08302-X
- MathSciNet review: 2213747