Abstract
Given k planar graphs G 1,…,G k , deciding whether they admit a simultaneous embedding with fixed edges (Sefe ) and whether they admit a simultaneous geometric embedding (Sge ) are NP-hard problems, for k ≥ 3 and for k ≥ 2, respectively. In this paper we consider the complexity of Sefe and of Sge when the graphs G 1,…,G k have a fixed planar embedding. In sharp contrast with the NP-hardness of Sefe for three non-embedded graphs, we show that Sefe is polynomial-time solvable for three graphs with a fixed planar embedding. Furthermore, we show that, given k embedded planar graphs G 1,…,G k , deciding whether a Sefe of G 1,…,G k exists and deciding whether an Sge of G 1,…,G k exists are NP-hard problems, for k ≥ 14 and k ≥ 13, respectively.
Work partially supported by the MIUR, project AlgoDEEP 2008TFBWL4, and by the ESF project 10-EuroGIGA-OP-003 “Graph Drawings and Representations”.
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Angelini, P., Di Battista, G., Frati, F. (2011). Simultaneous Embedding of Embedded Planar Graphs. In: Asano, T., Nakano, Si., Okamoto, Y., Watanabe, O. (eds) Algorithms and Computation. ISAAC 2011. Lecture Notes in Computer Science, vol 7074. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25591-5_29
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DOI: https://doi.org/10.1007/978-3-642-25591-5_29
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