Average-distance conjecture for touching Jordan curves

Let F\mathcal{F} be a kk-touching family of Jordan curves, meaning that no point of the plane lies on more than kk curves. For each pair of intersecting curves a,bFa,b\in\mathcal{F}, let d(a,b)d(a,b) be the number of curves whose bounded region contains exactly one of aa and bb, and define the average distance in F\mathcal{F} as the average of d(a,b)d(a,b) over all intersecting pairs.

Average-distance conjecture. For any kk-touching family F\mathcal{F} of Jordan curves, the average distance in F\mathcal{F} is at most

k2.\frac{k}{2}.

The conjecture concerns possibly nonsimple families of touching Jordan curves, in which two curves may intersect at several points. The supplied source text gives no resolution evidence for this claim; its status is therefore open.

Sources & referencesView supporting material

Primary source

Wouter Cames van Batenburg, Louis Esperet and Tobias Müller, “Coloring Jordan regions and curves”, arXiv:1608.08159 (2017).

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