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Clustered Colouring of Odd-$H$-Minor-Free Graphs

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arxiv 2308.15721 v2 pith:J6JTA36I submitted 2023-08-30 math.CO

classification math.CO
keywords clusteredmathcalchromaticgraphnumbertextcolouringadapt
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abstract

The clustered chromatic number of a graph class $\mathcal{G}$ is the minimum integer $c$ such that every graph $G\in\mathcal{G}$ has a $c$-colouring where each monochromatic component in $G$ has bounded size. We study the clustered chromatic number of graph classes $\mathcal{G}_H^{\text{odd}}$ defined by excluding a graph $H$ as an odd-minor. How does the structure of $H$ relate to the clustered chromatic number of $\mathcal{G}_H^{\text{odd}}$? We adapt a proof method of Norin, Scott, Seymour and Wood (2019) to show that the clustered chromatic number of $\mathcal{G}_H^{\text{odd}}$ is tied to the tree-depth of $H$.

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Cited by 1 Pith paper

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  1. 3-Colouring Planar Graphs

    math.CO 2025-07 conditional novelty 7.0 of 10

    Every n-vertex planar graph can be 3-coloured so that each monochromatic connected component has at most O(n^{4/9}) vertices, improving the previous O(n^{1/2}) bound.

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