On Optimal Beyond-Planar Graphs
Abstract
A graph is beyond-planar if it can be drawn in the plane with a specific restriction on crossings. Several types of beyond-planar graphs have been investigated, such as k-planar if every edge is crossed at most k times and RAC if edges can cross only at a right angle in a straight-line drawing. A graph is optimal if the number of edges coincides with the density for its type. Optimal graphs are special and are known only for some types of beyond-planar graphs, including 1-planar, 2-planar, and RAC graphs. For all types of beyond-planar graphs for which optimal graphs are known, we compute the range for optimal graphs, establish combinatorial properties, and show that every graph is a topological minor of an optimal graph. Note that the minor property is well-known for general beyond-planar graphs.
Cite
@article{arxiv.2201.00783,
title = {On Optimal Beyond-Planar Graphs},
author = {Franz J. Brandenburg},
journal= {arXiv preprint arXiv:2201.00783},
year = {2022}
}