Embedding Graphs into Two-Dimensional Simplicial Complexes

Authors Éric Colin de Verdière, Thomas Magnard, Bojan Mohar

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Éric Colin de Verdière
Thomas Magnard
Bojan Mohar

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Éric Colin de Verdière, Thomas Magnard, and Bojan Mohar. Embedding Graphs into Two-Dimensional Simplicial Complexes. In 34th International Symposium on Computational Geometry (SoCG 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 99, pp. 27:1-27:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)


We consider the problem of deciding whether an input graph G admits a topological embedding into a two-dimensional simplicial complex C. This problem includes, among others, the embeddability problem of a graph on a surface and the topological crossing number of a graph, but is more general. The problem is NP-complete when C is part of the input, and we give a polynomial-time algorithm if the complex C is fixed. Our strategy is to reduce the problem to an embedding extension problem on a surface, which has the following form: Given a subgraph H' of a graph G', and an embedding of H' on a surface S, can that embedding be extended to an embedding of G' on S? Such problems can be solved, in turn, using a key component in Mohar's algorithm to decide the embeddability of a graph on a fixed surface (STOC 1996, SIAM J. Discr. Math. 1999).
  • computational topology
  • embedding
  • simplicial complex
  • graph
  • surface


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