
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}.
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
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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