Abstract
We study biplane graphs drawn on a finite point set \(S\) in the plane in general position. This is the family of geometric graphs whose vertex set is \(S\) and which can be decomposed into two plane graphs. We show that every sufficiently large point set admits a 5-connected biplane graph and that there are arbitrarily large point sets that do not admit any 6-connected biplane graph. Furthermore, we show that every plane graph (other than a wheel or a fan) can be augmented into a 4-connected biplane graph. However, there are arbitrarily large plane graphs that cannot be augmented to a 5-connected biplane graph by adding pairwise noncrossing edges.
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Notes
The companion paper [18] contains a larger introduction to the concept of biplane graphs, comparing it with other related concepts such as the geometric thickness and others. Ideally, both papers will appear in the same journal issue. Preliminary versions of both papers have been presented at the Mexican Conference on Discrete Mathematics and Computational Geometry (Oaxaca, 2013) [18, 19]. To avoid repetition, a complete introduction is presented in the companion paper, and here we include only a brief self-contained introduction.
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Acknowledgments
A. G., F. H., M. K., R.I. S. and J. T. were partially supported by ESF EUROCORES programme EuroGIGA, CRP ComPoSe: grant EUI-EURC-2011-4306, and by project MINECO MTM2012-30951/FEDER. F. H., and R.I. S. were also supported by project Gen. Cat. DGR 2009SGR1040. A. G. and J. T. were also supported by project E58(ESF)-DGA. M. K. was supported by the Secretary for Universities and Research of the Ministry of Economy and Knowledge of the Government of Catalonia and the European Union. I. M. was supported by FEDER funds through COMPETE-Operational Programme Factors of Competitiveness, CIDMA and FCT within project PEst-C/MAT/UI4106/2011 with COMPETE number FCOMP-01-0124-FEDER-022690. M. S. was supported by the project NEXLIZ - CZ.1.07/2.3.00/30.0038, which is co-financed by the European Social Fund and the state budget of the Czech Republic, and by ESF EuroGIGA project ComPoSe as F.R.S.-FNRS-EUROGIGA NR 13604. R. S. was funded by Portuguese funds through CIDMA (Center for Research and Development in Mathematics and Applications) and FCT (Fundação para a Ciência e a Tecnologia), within project PEst-OE/MAT/UI4106/2014, and by FCT grant SFRH/BPD/88455/2012. C. T. was supported in part by NSERC (RGPIN 35586) and NSF (CCF-0830734).
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A preliminary version of this paper has been presented at the Mexican Conference on Discrete Mathematics and Computational Geometry, Oaxaca, México, November 2013 [19].
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García, A., Hurtado, F., Korman, M. et al. Geometric Biplane Graphs II: Graph Augmentation. Graphs and Combinatorics 31, 427–452 (2015). https://doi.org/10.1007/s00373-015-1547-0
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DOI: https://doi.org/10.1007/s00373-015-1547-0