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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)

 

Equality of two spectra arising in harmonic analysis and semigroup theory


Authors: Ralph Chill and Eva Fasangová
Journal: Proc. Amer. Math. Soc. 130 (2002), 675-681
MSC (2000): Primary 47D03; Secondary 47A10, 40E05
Published electronically: June 19, 2001
MathSciNet review: 1866019
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Abstract | References | Similar Articles | Additional Information

Abstract: We show that a new notion of a spectrum of a function $u\in L^\infty({\mathbb R}_+,X)$ ($X$ is a Banach space), defined by B. Basit and the first author, coincides with the Arveson spectrum of some shift group, provided $u$ is uniformly continuous. We apply this result to prove a new version of a tauberian theorem.


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Additional Information

Ralph Chill
Affiliation: Abteilung Angewandte Analysis, Universität Ulm, 89069 Ulm, Germany
Email: chill@mathematik.uni-ulm.de

Eva Fasangová
Affiliation: Department of Mathematical Analysis, Charles University, Sokolovská 83, 186 75 Praha 8, Czech Republic
Email: fasanga@karlin.mff.cuni.cz

DOI: http://dx.doi.org/10.1090/S0002-9939-01-06146-9
PII: S 0002-9939(01)06146-9
Keywords: Spectrum of a function, Arveson spectrum, $C_0$-group, Fourier transform, tauberian theorem
Received by editor(s): February 7, 2000
Received by editor(s) in revised form: August 2, 2000
Published electronically: June 19, 2001
Additional Notes: Part of this work was done while the first author visited the Charles University of Prague. He is grateful for the warm hospitality and the financial support. The second author is supported by grant No. 201/98/1450 of the Grant Agency of the Czech Republic, grant No. 166/1999 of the Grant Agency of Charles University, and grant No. CEZ J 13/98113200007.
Communicated by: David R. Larson
Article copyright: © Copyright 2001 American Mathematical Society