Fan-planarity: Properties and complexity ?
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 Kaufmann and Ueckerdt [35], who proved that every n -vertex fan-planar drawing has at most 5n?10 5 n ? 10 edges, and that this bound is tight for n?20 n ? 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.
graph planarity graph drawing edge crossings edge density