Discrete and Computational Geometry

Volume 2098 of the series Lecture Notes in Computer Science pp 125-136


On the Skeleton of the Metric Polytope

  • Antoine DezaAffiliated withPrediction and Control, Institute of Statistical MathematicsCentre d’Analyse et de Mathématique Sociales, EHESS
  • , Komei FukudaAffiliated withInstitute for Operations Research, ETH Zürich
  • , Dmitrii PasechnikAffiliated withOperations Research, TWI, Delft University of Technology
  • , Masanori SatoAffiliated withTokyo Institute of Technology, Math. and Comput. Sci.

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We consider convex polyhedra with applications to well-known combinatorial optimization problems: the metric polytope m n and its relatives. For n ≤ 6 the description of the metric polytope is easy as m n has at most 544 vertices partitioned into 3 orbits; m 7 - the largest previously known instance - has 275 840 vertices but only 13 orbits. Using its large symmetry group, we enumerate orbitwise 1 550 825 600 vertices of the 28-dimensional metric polytope m s . The description consists of 533 orbits and is conjectured to be complete. The orbitwise incidence and adjacency relations are also given. The skeleton of m s could be large enough to reveal some general features of the metric polytope on n nodes. While the extreme connectivity of the cuts appears to be one of the main features of the skeleton of m n , we conjecture that the cut vertices do not form a cut-set. The combinatorial and computational applications of this conjecture are studied. In particular, a heuristic skipping the highest degeneracy is presented.