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research-article

Weak diameter coloring of graphs on surfaces

Published: 01 October 2024 Publication History

Abstract

Consider a graph G drawn on a fixed surface, and assign to each vertex a list of colors of size at least two if G is triangle-free and at least three otherwise. We prove that we can give each vertex a color from its list so that each monochromatic connected subgraph has bounded weak diameter (i.e., diameter measured in the metric of the whole graph G, not just the subgraph). In case that G has bounded maximum degree, this implies that each connected monochromatic subgraph has bounded size. This solves a problem of Esperet and Joret for planar triangle-free graphs, and extends known results in the general case to the list setting, answering a question of Wood.

References

[1]
Bonamy M., Bousquet N., Esperet L., Groenland C., Liu C., Pirot F., Scott A., Asymptotic dimension of minor-closed families and assouad-nagata dimension of surfaces, J. Eur. Math. Soc. (2021).
[2]
Wood D.R., Defective and clustered graph colouring, Electron. J. Combin. 1000 (2018) 23–13.
[3]
Esperet L., Joret G., Colouring planar graphs with three colours and no large monochromatic components, Combin. Probab. Comput. 23 (2014) 551–570.
[4]
Dvořák Z., Norin S., Islands in minor-closed classes. I. Bounded treewidth and separators, 2017, arXiv:1710.02727.
[5]
Robertson N., Seymour P.D., Graph minors. III. Planar tree-width, J. Combin. Theory Ser. B 36 (1984) 49–64.

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Information & Contributors

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Published In

cover image European Journal of Combinatorics
European Journal of Combinatorics  Volume 121, Issue C
Oct 2024
316 pages

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Academic Press Ltd.

United Kingdom

Publication History

Published: 01 October 2024

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