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Lipschitz-type conditions on homogeneous Banach spaces of analytic functions

Authors: Oscar Blasco; Georgios Stylogiannis;

Lipschitz-type conditions on homogeneous Banach spaces of analytic functions

Abstract

Let \(\mathcal H(\mathbb D)\) be the space of all analytic functions on the unit disk \(\mathbb D \subset \mathbb C\) with the topology of uniform convergence on compact subsets of \(\mathbb D\). For \(f\in \mathcal H(\mathbb D)\) denote \((P_{r}f)(z)=f(rz)\), \(0\leq r<1\), \((R_{t}f)(z)=f(e^{it}z)\), \(t\in\mathbb R\), \((s_{n}f)(z)=\sum_{k=0}^{n}a_{k}z^{k}\) for \(f(z)=\sum_{k=0}^{\infty}a_{k}z^{k}\) and \(n\in\mathbb N\). Let \(A(\mathbb D)\) be the disk algebra. A Banach space \(X\) is called a Banach space of analytic functions if \(A(\mathbb D)\subset X \subset \mathcal H(\mathbb D)\) with continuous inclusions. Such space \(X\) is called homogeneous if it is invariant for all operators \(P_{r}\) and \(R_{t}\), \(R_{t}\) are isometric on \(X\) and \(P_{r}\) are uniformly bounded on \(X\). Let \(\omega:[0,\pi]\to\mathbb R^{+}\) be a continuous and non-decreasing weight function such that \(\omega(0)=0\) satisfying some additional conditions. The main result of the paper establishes the equivalence of some statements for the functions from a homogeneous Banach space \(X\) of analytic functions satisfying some additional conditions. We mention here three of these properties: 1) \(\| R_{t}f - f \|_{X}=O(\omega(t))\), \(t \to 0^{+}\); 2) \(\| P_{r}f - f \|_{X}=O(\omega(1-r))\), \(r \to 1^{-}\); 3) \(\| f - s_{n}f \|_{X}=O(\omega(n^{-1}))\), \(n\to\infty\).

Keywords

Lipschitz-type conditions, approximation by partial sums, Banach spaces of continuous, differentiable or analytic functions, Banach spaces of analytic functions, Spaces and algebras of analytic functions of one complex variable

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Top 10%
Average
Average
hybrid
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