Reconstruction of the path graph

Chaya Keller, Yael Stein

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Let P be a set of n≥5 points in convex position in the plane. The path graph G(P) of P is an abstract graph whose vertices are non-crossing spanning paths of P, such that two paths are adjacent if one can be obtained from the other by deleting an edge and adding another edge. We prove that the automorphism group of G(P) is isomorphic to Dn, the dihedral group of order 2n. The heart of the proof is an algorithm that first identifies the vertices of G(P) that correspond to boundary paths of P, where the identification is unique up to an automorphism of K(P) as a geometric graph, and then identifies (uniquely) all edges of each path represented by a vertex of G(P). The complexity of the algorithm is O(Nlog⁡N) where N is the number of vertices of G(P).

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalComputational Geometry: Theory and Applications
StatePublished - 1 Jun 2018


  • Convex geometric graphs
  • Geometric graphs
  • Hamiltonian paths
  • Reconstruction

ASJC Scopus subject areas

  • Computer Science Applications
  • Geometry and Topology
  • Control and Optimization
  • Computational Theory and Mathematics
  • Computational Mathematics


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