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Fan-planarity: properties and complexity. (English) Zbl 1317.68134

Summary: In a fan-planar drawing of a graph an edge can cross only edges with a common end-vertex. Fan-planar drawings have been recently introduced by M. Kaufmann and T. Ueckerdt [“The density of fan-planar graphs”, Preprint, arXiv:1403.6184], who proved that every \(n\)-vertex fan-planar drawing has at most \(5n-10\) edges, and that this bound is tight for \(n \geq 20\). We extend their result from both the combinatorial and the algorithmic point of view. We prove tight bounds on the density of constrained versions of fan-planar drawings and study the relationship between fan-planarity and \(k\)-planarity. Also, we prove that testing fan-planarity in the variable embedding setting is NP-complete.

MSC:

68R10 Graph theory (including graph drawing) in computer science
05C10 Planar graphs; geometric and topological aspects of graph theory
68Q17 Computational difficulty of problems (lower bounds, completeness, difficulty of approximation, etc.)

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