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Advances in Mathematics
Article . 2019 . Peer-reviewed
License: Elsevier Non-Commercial
Data sources: Crossref
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zbMATH Open
Article . 2019
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Equivalence of the global and local Markov inequalities in the complex plane

Authors: Białas-Cież, Leokadia; Eggink, Raimondo;

Equivalence of the global and local Markov inequalities in the complex plane

Abstract

A compact set $E$ in the complex plane is said to admit the \textit{global Markov inequality} $\text{GMI}(k)$, $k\geq1$, if there exists a constant $M\geq1$ such that \[ {\|p'\|}_{E}\leq Mn^k{\|p\|}_{E} \] holds for any polynomial $p$ of degree at most $n$. It admits the \textit{local Markov property} $\text{LMP}(m)$ if there exist constants $c,k\geq1$ such that \[ |p^{(j)}(z_0)|\leq\bigl(\frac{cn^k}{r^m}\Bigr)^j{\|p\|}_{E\cap{B}(z_0,r)} \] holds for all $n\in{\mathbb N}$, $j\in\{1,\ldots,n\}$, $z_0\in E$, $r\in\left(0,1\right]$, and any polynomial $p$ of degree at most $n$. Hereby, ${\|\cdot\|}_{E}$ is the supremum norm on $E$ and $B(z_0,r)$ is the closed ball with center $z_0$ and radius $r$. Note that the local Markov property implies the global Markov inequality. The main result of the paper is that $\text{GMI}(k)$ implies $\text{LMP}(m)$ (for certain $m$) if $E$ satisfies a certain \textit{Jackson property}.

Country
Poland
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Keywords

Green function, Potentials and capacity, harmonic measure, extremal length and related notions in two dimensions, Markov inequality, Jackson inequality, Inequalities in the complex plane, Kolmogorov inequality, Approximation in the complex plane, Inequalities in approximation (Bernstein, Jackson, Nikol'skiĭ-type inequalities), extension operators

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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!
1
Average
Average
Average
Green