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Infinite dimensional universal subspaces generated by Blaschke products
Author(s):
Raymond
Mortini
Journal:
Proc. Amer. Math. Soc.
135
(2007),
1795-1801.
MSC (2000):
Primary 30D50;
Secondary 47B33, 46J15, 30H05
Posted:
December 28, 2006
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Abstract:
Let be the Banach algebra of all bounded analytic functions in the unit disk . A function is said to be universal with respect to the sequence of noneuclidian translates, if the set is locally uniformly dense in the set of all holomorphic functions bounded by . We show that for any sequence of points in tending to the boundary there exists a closed subspace of , topologically generated by Blaschke products, and linear isometric to , such that all of its elements are universal with respect to noneuclidian translates. The proof is based on certain interpolation problems in the corona of . Results on cyclicity of composition operators in are deduced.
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Additional Information:
Raymond
Mortini
Affiliation:
Département de Mathématiques, Université Paul Verlaine, Ile du Saulcy F-57045 Metz, France
Email:
mortini@math.univ-metz.fr
DOI:
10.1090/S0002-9939-06-08669-2
PII:
S 0002-9939(06)08669-2
Keywords:
Universal Blaschke products,
interpolation in the corona,
composition operators on Hardy spaces,
joint cyclic vectors
Received by editor(s):
September 6, 2005
Received by editor(s) in revised form:
February 5, 2006.
Posted:
December 28, 2006
Additional Notes:
The author thanks the referee for his/her comments improving the exposition of this work
Communicated by:
Joseph A. Ball
Copyright of article:
Copyright
2006,
American Mathematical Society
The copyright for this article reverts to public domain after 28 years from publication.
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