An Experimental Study of Forbidden Patterns in Geometric Permutations by Combinatorial Lifting

Authors Xavier Goaoc, Andreas Holmsen, Cyril Nicaud



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Author Details

Xavier Goaoc
  • Université de Lorraine, CNRS, Inria, LORIA, F-54000 Nancy, France
Andreas Holmsen
  • Department of Mathematical Sciences, KAIST, Daejeon, South Korea
Cyril Nicaud
  • Université Paris-Est, LIGM (UMR 8049), CNRS, ENPC, ESIEE, UPEM, F-77454, Marne-la-Vallée, France

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Xavier Goaoc, Andreas Holmsen, and Cyril Nicaud. An Experimental Study of Forbidden Patterns in Geometric Permutations by Combinatorial Lifting. In 35th International Symposium on Computational Geometry (SoCG 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 129, pp. 40:1-40:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019) https://doi.org/10.4230/LIPIcs.SoCG.2019.40

Abstract

We study the problem of deciding if a given triple of permutations can be realized as geometric permutations of disjoint convex sets in R^3. We show that this question, which is equivalent to deciding the emptiness of certain semi-algebraic sets bounded by cubic polynomials, can be "lifted" to a purely combinatorial problem. We propose an effective algorithm for that problem, and use it to gain new insights into the structure of geometric permutations.

Subject Classification

ACM Subject Classification
  • Theory of computation → Computational geometry
  • Computing methodologies → Combinatorial algorithms
Keywords
  • Geometric permutation
  • Emptiness testing of semi-algebraic sets
  • Computer-aided proof

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