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arXiv · 2611.09125

Every IC-planar graph has weak-strict degeneracy at most 6

Zhen He·Yilong Li·Tao Wang·Xiaojing Yang
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Abstract

We prove that every IC-planar graph has weak-strict degeneracy at most $6$. Weak-strict degeneracy is the weak degeneracy of Bernshteyn and Lee plus one, so it bounds the coloring parameters controlled by weak degeneracy. In particular, every IC-planar graph is $6$-choosable, $6$-DP-colorable and $6$-paintable, which strengthens the theorem of Yang, Wang, Wang and Lih that IC-planar graphs are $6$-choosable. An IC-planar graph is a subgraph of a plane graph in which a set of pairwise vertex-disjoint inner $4$-faces, called marked faces, receive both diagonals. Our main tool is a Thomassen-type statement for such graphs: vertices of marked faces get one extra unit, except those in a prescribed independent set of boundary vertices. With no marked faces, this statement is exactly the theorem of Bernshteyn, Lee and Smith-Roberge that gives weak-strict degeneracy at most $5$ for planar graphs, so it contains both results. We prove it by a minimal-counterexample argument following Bernshteyn, Lee and Smith-Roberge. The new ingredients are a deletion rule that turns destroyed marked faces into ordinary edges, a pseudo-$2$-chord lemma for paths that use one diagonal, and a choice of orientation of the outer cycle that avoids a vertex of the independent set joined to two vertices of the prescribed boundary path.

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Zhen He, Yilong Li, Tao Wang, Xiaojing Yang. 2026-11-06. Every IC-planar graph has weak-strict degeneracy at most 6. https://arxiv.org/abs/2611.09125

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