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Coloring hypergraphs defined by pseudo-disks

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Coloring hypergraphs defined by pseudo-disks
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21
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CC Attribution - NonCommercial - NoDerivatives 4.0 International:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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We present several results about coloring geometric hypergraphs that are defined by pseudo-disk arrangements. In particular, we prove that the intersection hypergraph of a finite family of pseudo-disks with respect to another family of pseudo-disks admits a proper coloring with 4 colors. Along the way we prove that the corresponding Delaunay-graph is planar. Our results serve as a common generalization and strengthening of many earlier results, including ones about coloring points with respect to pseudo-disks, coloring pseudo-disks with respect to points and coloring disks with respect to disks.