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arXiv · 1904.12060

Every planar graph with $\Delta\geqslant 8$ is totally $(\Delta+2)$-choosable

Marthe Bonamy·Théo Pierron·Éric Sopena
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Abstract

Total coloring is a variant of edge coloring where both vertices and edges are to be colored. A graph is totally $k$-choosable if for any list assignment of $k$ colors to each vertex and each edge, we can extract a proper total coloring. In this setting, a graph of maximum degree $\Delta$ needs at least $\Delta+1$ colors. In the planar case, Borodin proved in 1989 that $\Delta+2$ colors suffice when $\Delta$ is at least 9. We show that this bound also holds when $\Delta$ is $8$.

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Marthe Bonamy, Théo Pierron, Éric Sopena. 2019-04-26. Every planar graph with $\Delta\geqslant 8$ is totally $(\Delta+2)$-choosable. https://arxiv.org/abs/1904.12060

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