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arXiv · 2507.19762

The maximum number of edges of bipartite 1-planar graphs with 1-disk drawings

Guiping Wang
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Abstract

A graph is 1-planar if it admits a drawing in the plane such that each edge is crossed at most once. Let G be a bipartite 1-planar graph with bipartition sets X and Y . A 1-disk OX drawing of G is a 1-planar drawing such that all vertices of X lie on the boundary of O and all vertices of Y and all edges of G locate in the interior of O, where O is a disk on the plane. The concept was first proposed by Huang, Ouyang and Dong when they solved a conjecture about the edge density of bipartite 1-planar graphs. Additionally, they presented a problem of determining the maximum number of edges in a bipartite graph with a 1-disk OX drawing. In this paper, we solve this problem and prove that every bipartite graph G which has a 1-disk OX drawing has at most 2|V(G)|+|X|-6 edges. Moreover, we demonstrate that this upper bound is tight, in the sense that there are infinitely many graphs for which this bound is attained exactly.

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Guiping Wang. 2026-09-13. The maximum number of edges of bipartite 1-planar graphs with 1-disk drawings. https://doi.org/10.1080/09728600.2025.2585816

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