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Disc representation. Koebe (1936). Every planar graph can be represented by touching circles. Polyhedral version. Every 3-connected planar graph is the skeleton of a convex polytope such that every edge touches the unit sphere. Andre’ev. From polyhedra to circles. horizon.
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Disc representation Koebe (1936) Every planar graph can be represented by touching circles
Polyhedral version Every 3-connected planar graph is the skeleton of a convex polytope such that every edge touches the unit sphere Andre’ev
From polyhedra to circles horizon
disc representation disc representation graph dual horizon