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Isometries of the Dirichlet space among the composition operators
Author(s):
María
J.
Martín;
Dragan
Vukotic
Journal:
Proc. Amer. Math. Soc.
134
(2006),
1701-1705.
MSC (2000):
Primary 47B33, 31C25
Posted:
December 2, 2005
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Abstract:
We show that every composition operator which is an isometry of the Dirichlet space is induced by a univalent full map of the disk into itself that fixes the origin. This is an analogue of the Hardy space result for inner functions due to Nordgren. The proof relies on the Stone-Weierstrass theorem and the Riesz representation theorem.
References:
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Additional Information:
María
J.
Martín
Affiliation:
Departamento de Economía, Universidad Carlos III de Madrid, Calle Madrid 126, 28903 Getafe (Madrid), Spain
Address at time of publication:
Departamento de Matemáticas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
Email:
mjmartin@eco.uc3m.es, mjose.martin@uam.es
Dragan
Vukotic
Affiliation:
Departamento de Matemáticas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
Email:
dragan.vukotic@uam.es
DOI:
10.1090/S0002-9939-05-08182-7
PII:
S 0002-9939(05)08182-7
Received by editor(s):
December 14, 2004
Received by editor(s) in revised form:
January 10, 2005
Posted:
December 2, 2005
Additional Notes:
Both authors were supported by MCyT grant BFM2003-07294-C02-01, Spain.
Communicated by:
Joseph A. Ball
Copyright of article:
Copyright
2005,
American Mathematical Society
The copyright for this article reverts to public domain after 28 years from publication.
Forward Citation(s): Information for authors on submitting citations The following works have cited this article Brent J. Carswell; Christopher Hammond , Composition operators with maximal norm on weighted Bergman spaces, Proc. Amer. Math. Soc. 134 (2006), S 0002-9939(06)08271-2 , posted on 02/17/2006, 2599-2605. (English)
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