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The Book Thickness of 1-Planar Graphs is Constant

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Abstract

In a book embedding, the vertices of a graph are placed on the “spine” of a book and the edges are assigned to “pages”, so that edges on the same page do not cross. In this paper, we prove that every 1-planar graph (that is, a graph that can be drawn on the plane such that no edge is crossed more than once) admits an embedding in a book with constant number of pages. To the best of our knowledge, the best non-trivial previous upper-bound is \(O(\sqrt{n})\), where n is the number of vertices of the graph.

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Notes

  1. We will shortly adjust this choice for two special cases. However, since we do not seek to enter into further details at this point, we assume for now that the choice is, in general, arbitrary.

  2. The term yields from the observation that along the boundary of the block-tree a 2-hop can “bypass” only one vertex because of maximal 1-planarity.

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Acknowledgments

We thank S. Kobourov and J. Toenniskoetter for useful discussions. We also thank David R. Wood for pointing out an error in the first version of this paper.

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Correspondence to Michael A. Bekos.

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This article is based on the preliminary version: [Michael A. Bekos, Till Bruckdorfer, Michael Kaufmann and Chrysanthi N. Raftopoulou: 1-Planar Graphs have Constant Book Thickness. In N. Bansal and I. Finocchi editors, Proc. of 23rd European Symposium on Algorithms (ESA 2015), LNCS 9294, pp. 130–141, 2015].

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Bekos, M.A., Bruckdorfer, T., Kaufmann, M. et al. The Book Thickness of 1-Planar Graphs is Constant. Algorithmica 79, 444–465 (2017). https://doi.org/10.1007/s00453-016-0203-2

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