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2000 Multipliers on vector spaces of holomorphic functions
Hermann Render, Andreas Sauer
Nagoya Math. J. 159: 167-178 (2000).


Let $G$ be a domain in the complex plane containing zero and $ H(G) $ be the set of all holomorphic functions on $G$. In this paper the algebra $M(H(G))$ of all coefficient multipliers with respect to the Hadamard product is studied. Central for the investigation is the domain $\widehat{G}$ introduced by Arakelyan which is by definition the union of all sets ${1\over w }G$ with $w \in G^c$. The main result is the description of all isomorphisms between these multipliers algebras. As a consequence one obtains: If two multiplier algebras $M(H(G_1 ))$ and $M(H(G_2 ))$ are isomorphic then $\widehat{G_1 }$ is equal to $\widehat{G_2}$. Two algebras $H(G_1 )$ and $H(G_2)$ are isomorphic with respect to the Hadamard product if and only if $G_1$ is equal to $G_2$. Further the following uniqueness theorem is proved: If $G_1$ is a domain containing $0$ and if $M(H(G))$ is isomorphic to $H(G_1 )$ then $G_1$ is equal to $\widehat{G}$.


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Hermann Render. Andreas Sauer. "Multipliers on vector spaces of holomorphic functions." Nagoya Math. J. 159 167 - 178, 2000.


Published: 2000
First available in Project Euclid: 27 April 2005

zbMATH: 0970.30028
MathSciNet: MR1783568

Primary: 46E25
Secondary: ‎30H05 , 46J99‎ , 47B38

Rights: Copyright © 2000 Editorial Board, Nagoya Mathematical Journal

Vol.159 • 2000
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