Abstract
Generalizations of the Andreev-Thurston circle packing theorem are proved. One such result is the following.
Let G=G(V) be a planar graph, and for each vertex v ∈ V, let ℱ v be a proper 3-manifold of smooth topological disks in S 2,with the property that the pattern of intersection of any two sets A, B ∈ ℱ v is topologically the pattern of intersection of two circles (i.e., there is a homeomorphism h:S 2→S 2 taking A and B to circles). Then there is a packing P=(P v :v ∈V)whose nerve is G, and which satisfies P v ∈ ℱ ν for v ∈ V. (‘The nerve is G’ means that two sets, P v ,P u ,touch, if, and only if, u ↔ v is an edge in G.)
In the case whereG is the 1-skeleton of a triangulation, we also give a precise uniqueness statement. Various examples and applications are discussed.
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Schramm, O. Existence and uniqueness of packings with specified combinatorics. Israel J. Math. 73, 321–341 (1991). https://doi.org/10.1007/BF02773845
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DOI: https://doi.org/10.1007/BF02773845