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


An abstract approach to Bohr's phenomenon

Authors: L. Aizenberg, A. Aytuna and P. Djakov
Journal: Proc. Amer. Math. Soc. 128 (2000), 2611-2619
MSC (2000): Primary 32A37, 32A05; Secondary 46E10
Published electronically: March 1, 2000
MathSciNet review: 1657738
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Abstract: In 1914 Bohr discovered that there exists $r \in (0,1)$ such that if a power series converges in the unit disk and its sum has modulus less than $1$, then for $ \vert z\vert < r $ the sum of absolute values of its terms is again less than $1$. Recently analogous results were obtained for functions of several variables. Our aim here is to present an abstract approach to the problem and show that Bohr's phenomenon occurs under very general conditions.

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Additional Information

L. Aizenberg
Affiliation: Department of Mathematics and Computer Science, Bar-Ilan University, 52900Ramat-Gan, Israel

A. Aytuna
Affiliation: Department of Mathematics, Middle East Technical University, 06531 Ankara, Turkey

P. Djakov
Affiliation: Department of Mathematics, Sofia University, 1164 Sofia, Bulgaria

PII: S 0002-9939(00)05270-9
Keywords: Spaces of holomorphic functions, Bohr phenomenon
Received by editor(s): July 17, 1998
Received by editor(s) in revised form: October 15, 1998
Published electronically: March 1, 2000
Additional Notes: The first author’s research was supported by the BSF grant No 94-00113
The second author wishes to thank L. Aizenberg and institute E. Noether for the invitation to Bar-Ilan University and their hospitality during his visit in Israel
The third author’s research was supported in part by NRF of Bulgaria, grant no. MM-808/98
Communicated by: Steven R. Bell
Article copyright: © Copyright 2000 American Mathematical Society

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