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A Bernstein-type inequality for rational functions in weighted Bergman spaces
Anton Baranov 1, Rachid Zarouf 2
(27/06/2012)

Given $n\geq1$ and $r\in[0,\,1),$ we consider the set $\mathcal{R}_{n,\, r}$ of rational functions having at most $n$ poles all outside of $\frac{1}{r}\mathbb{D},$ were $\mathbb{D}$ is the unit disc of the complex plane. We give an asymptotically sharp Bernstein-type inequality for functions in $\mathcal{R}_{n,\, r}\:$ (as n tends to infinity and r tends to 1-) in weighted Bergman spaces with ''polynomially'' decreasing weights. We also prove that this result can not be extended to weighted Bergman spaces with ''super-polynomially'' decreasing weights.
1 :  Department of Mathematics and Mechanics
St. Petersburg State University
2 :  Laboratoire d'Analyse, Topologie, Probabilités (LATP)
CNRS : UMR6632 – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III
Mathématiques/Analyse fonctionnelle
Rational function – Bernstein-type inequality – weighted Bergman norm
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