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Superposition operators, Hardy spaces, and Dirichlet type spaces
- Source :
- Journal of Mathematical Analysis and Applications 463 (2018), 2, 659-680
- Publication Year :
- 2016
-
Abstract
- For $0<p<\infty $ and $\alpha >-1$ the space of Dirichlet type $\mathcal D^p_\alpha $ consists of those functions $f$ which are analytic in the unit disc $\mathbb D$ and satisfy $\int_{\mathbb D}(1-| z| )^\alpha| f^\prime (z)| ^p\,dA(z)<\infty $. The space $\Dp$ is the closest one to the Hardy space $H^p$ among all the $\mathcal D^p_\alpha $. Our main object in this paper is studying similarities and differences between the spaces $H^p$ and $\Dp$ ($0<p<\infty $) regarding superposition operators. Namely, for $0<p<\infty $ and $0<s<\infty $, we characterize the entire functions $\varphi $ such that the superposition operator $S_\varphi $ with symbol $\varphi $ maps the conformally invariant space $Q_s$ into the space $\Dp$, and, also, those which map $\Dp$ into $Q_s$ and we compare these results with the corresponding ones with $H^p$ in the place of $\Dp$. We also study the more general question of characterizing the superposition operators mapping $\mathcal D^p_\alpha $ into $Q_s$ and $Q_s$ into $\mathcal D^p_\alpha $, for any admissible triplet of numbers $(p, \alpha , s)$.
- Subjects :
- Mathematics - Complex Variables
Primary 47B35, Secondary 30H10
Subjects
Details
- Database :
- arXiv
- Journal :
- Journal of Mathematical Analysis and Applications 463 (2018), 2, 659-680
- Publication Type :
- Report
- Accession number :
- edsarx.1611.05265
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.jmaa.2018.03.044