Radial extension of a bi-Lipschitz parametrization of a starlike Jordan curve

Details Radial extension of a bi-Lipschitz parametrization of a starlike Jordan curve Radial extension of a bi-Lipschitz parametrization of a starlike Jordan curve

2010-11-23

arxiv.org/abs/1011.5204v1

Mathematics

Complex Variables

14 pages, 1 figure

Scientific paper

In this paper we discus the radial extension $w$ of a bi-Lipschitz parameterization $F(e^{it})=f(t)$ of a starlike Jordan curve $\gamma$ w.r. to $0$. We show that, if parameterization is bi-Lipschitz, then the extension is bi-Lipschitz and consequently quasiconformal. If $\gamma$ is the unit circle, then $\mathrm{Lip}(f)=\mathrm{Lip}(F)=\mathrm{Lip}(w)=K_w$. If $\gamma$ is not a circle centered at origin, and $F$ is a polar parametrization of $\gamma$, then we show that $\mathrm{Lip}(f)=\mathrm{Lip}(F)<\mathrm{Lip}(w)$.

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