Abstract
We show that planar graphs have bounded queue-number, thus proving a conjecture of Heath et al. [66] from 1992. The key to the proof is a new structural tool called layered partitions, and the result that every planar graph has a vertex-partition and a layering, such that each part has a bounded number of vertices in each layer, and the quotient graph has bounded treewidth. This result generalises for graphs of bounded Euler genus. Moreover, we prove that every graph in a minor-closed class has such a layered partition if and only if the class excludes some apex graph. Building on this work and using the graph minor structure theorem, we prove that every proper minor-closed class of graphs has bounded queue-number.
Layered partitions have strong connections to other topics, including the following two examples. First, they can be interpreted in terms of strong products. We show that every planar graph is a subgraph of the strong product of a path with some graph of bounded treewidth. Similar statements hold for all proper minor-closed classes. Second, we give a simple proof of the result by DeVos et al. [31] that graphs in a proper minor-closed class have low treewidth colourings.
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- David R. Wood. 2009. On tree-partition-width. European J. Combin. 30, 5 (2009), 1245–1253. DOI:https://doi.org/10.1016/j.ejc.2008.11.010 MR: 2514645.Google ScholarDigital Library
- David R. Wood. 2011. Clique minors in Cartesian products of graphs. New York J. Math. 17 (2011), 627–682. http://nyjm.albany.edu/j/2011/17-28.htmlGoogle Scholar
- David R. Wood. 2013. Treewidth of Cartesian products of highly connected graphs. J. Graph Theory 73, 3 (2013), 318–321. DOI:https://doi.org/10.1002/jgt.21677Google ScholarCross Ref
- Zefang Wu, Xu Yang, and Qinglin Yu. 2010. A note on graph minors and strong products. Appl. Math. Lett. 23, 10 (2010), 1179–1182. DOI:https://doi.org/10.1016/j.aml.2010.05.007 MR: 2665591.Google ScholarCross Ref
- Mihalis Yannakakis. 1989. Embedding planar graphs in four pages. J. Comput. System Sci. 38, 1 (1989), 36–67. DOI:https://doi.org/10.1016/0022-0000(89)90032-9 MR: 0990049.Google ScholarDigital Library
- Vida Dujmović, Pat Morin, and David R. Wood. 2019. Graph product structure for non-minor-closed classes. arXiv: 1907.05168.Google Scholar
Index Terms
- Planar Graphs Have Bounded Queue-Number
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