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- W4289539981 abstract "We characterize the model spaces $K_Theta$ in which functions with smooth boundary extensions are dense. It is shown that such approximations are possible if and only if the singular measure associated to the singular inner factor of $Theta$ is concentrated on a countable union of Beurling-Carleson sets. In fact, we use a duality argument to show that if there exists a restriction of the associated singular measure which does not assign positive measure to Beurling-Carleson sets, then even larger classes of functions, such as Holder classes and large collections of analytic Sobolev spaces, fail to be dense. In contrast to earlier results on density of functions with continuous extensions to the boundary in $K_Theta$ and related spaces, the existence of a smooth approximant is obtained through a constructive method." @default.
- W4289539981 created "2022-08-03" @default.
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- W4289539981 date "2021-01-05" @default.
- W4289539981 modified "2023-09-29" @default.
- W4289539981 title "On model spaces and density of functions smooth on the boundary" @default.
- W4289539981 doi "https://doi.org/10.48550/arxiv.2101.01746" @default.
- W4289539981 hasPublicationYear "2021" @default.
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