Mathematical Programming

, Volume 5, Issue 1, pp 29–40 | Cite as

Edmonds polytopes and weakly hamiltonian graphs

  • Václav Chvátal


Jack Edmonds developed a new way of looking at extremal combinatorial problems and applied his technique with a great success to the problems of the maximal-weight degreeconstrained subgraphs. Professor C. St. J.A. Nash-Williams suggested to use Edmonds' approach in the context of hamiltonian graphs. In the present paper, we determine a new set of inequalities (the “comb inequalities”) which are satisfied by the characteristic functions of hamiltonian circuits but are not explicit in the straightforward integer programming formulation. A direct application of the linear programming duality theorem then leads to a new necessary condition for the existence of hamiltonian circuits; this condition appears to be stronger than the ones previously known. Relating linear programming to hamiltonian circuits, the present paper can also be seen as a continuation of the work of Dantzig, Fulkerson and Johnson on the traveling salesman problem.


Characteristic Function Mathematical Method Integer Programming Direct Application Great Success 
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Copyright information

© The Mathematical Programming Society 1973

Authors and Affiliations

  • Václav Chvátal
    • 1
  1. 1.Université de MontréalMontréalCanada

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