Sharp estimate on the inner distance in planar domains

Danka Lučić; Enrico Pasqualetto; Tapio Rajala

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arXiv · 1905.07988

Sharp estimate on the inner distance in planar domains

Danka Lučić·Enrico Pasqualetto·Tapio Rajala

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Abstract

We show that the inner distance inside a bounded planar domain is at most the one-dimensional Hausdorff measure of the boundary of the domain. We prove this sharp result by establishing an improved Painlev\'e length estimate for connected sets and by using the metric removability of totally disconnected sets, proven by Kalmykov, Kovalev, and Rajala. We also give a totally disconnected example showing that for general sets the Painlev\'e length bound $\kappa(E) \le\pi \mathcal{H}^1(E)$ is sharp.

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Danka Lučić, Enrico Pasqualetto, Tapio Rajala. 2019-05-20. Sharp estimate on the inner distance in planar domains. https://arxiv.org/abs/1905.07988

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