Triangle-Free Simple 2-Matchings in Subcubic Graphs (Extended Abstract)

  • David Hartvigsen
  • Yanjun Li
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4513)


A simple 2-matching in an edge-weighted graph is a subgraph all of whose vertices have degree 1 or 2. We consider the problem of finding a maximum weight simple 2-matching that contains no triangles, which is closely related to a class of relaxations of the TSP. Our main results are, for graphs with maximum degree 3, a complete description of the convex hull of incidence vectors of triangle-free simple 2-matchings and a strongly polynomial time algorithm for the above problem. Our system requires the use of a type of comb inequality (introduced by Grötschel and Padberg for the TSP polytope) that has {0,1,2}-coefficients and hence is more general than the well-known blossom inequality used in Edmonds’ characterization of the simple 2-matching polytope.


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Copyright information

© Springer Berlin Heidelberg 2007

Authors and Affiliations

  • David Hartvigsen
    • 1
  • Yanjun Li
    • 2
  1. 1.Mendoza College of Business, University of Notre Dame, Notre Dame, IN 46556USA
  2. 2.Krannert School of Management, Purdue University, West Lafayette, IN 47907USA

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