Geometric constructions of thin Blaschke products and reducing subspace problem

Geometric constructions of thin Blaschke products and reducing subspace problem
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薄 Blaschke 产品的几何结构和减少子空间问题

DOI:
10.1112/plms/pdu027
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发表时间:
2013-06
期刊:
Proc. London Math. Soc.
影响因子:
--
通讯作者:
Hansong Huang
Hansong Huang
中科院分区:
其他
文献类型:
--
作者:
Kunyu Guo;Hansong Huang

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In this paper, we mainly study geometric constructions of thin Blaschke products B and reducing subspace problem of multiplication operators induced by such symbols B on the Bergman space. Considering such multiplication operators MB , we present a representation of those operators commuting with both MB and MB* . It is shown that for ‘most’ thin Blaschke products B , MB is irreducible, that is, MB has no nontrivial reducing subspace; and such a thin Blaschke product B is constructed. As an application of the methods, it is proved that for ‘most’ finite Blaschke products ϕ , Mϕ has exactly two minimal reducing subspaces. Furthermore, under a mild condition, we get a geometric characterization for when MB defined by a thin Blaschke product B has a nontrivial reducing subspace.
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