Abstract
A graph is k-planar \((k \ge 1)\) if it can be drawn in the plane such that no edge is crossed \(k+1\) times or more. A graph is k-quasi-planar \((k \ge 2)\) if it can be drawn in the plane with no k pairwise crossing edges. The families of k-planar and k-quasi-planar graphs have been widely studied in the literature, and several bounds have been proven on their edge density. Nonetheless, only trivial results are known about the relationship between these two graph families. In this paper we prove that, for \(k \ge 3\), every k-planar graph is \((k+1)\)-quasi-planar.
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Acknowledgements
The research in this paper started at the Dagstuhl Seminar 16452 “Beyond-Planar Graphs: Algorithmics and Combinatorics”. We thank all participants, and in particular Pavel Valtr and Raimund Seidel, for useful discussions on the topic.
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Angelini, P. et al. (2017). On the Relationship Between k-Planar and k-Quasi-Planar Graphs. In: Bodlaender, H., Woeginger, G. (eds) Graph-Theoretic Concepts in Computer Science. WG 2017. Lecture Notes in Computer Science(), vol 10520. Springer, Cham. https://doi.org/10.1007/978-3-319-68705-6_5
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DOI: https://doi.org/10.1007/978-3-319-68705-6_5
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