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A characterization of PM-compact Hamiltonian bipartite graphs

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Abstract

The perfect matching polytope of a graph G is the convex hull of the incidence vectors of all perfect matchings in G. A graph is called perfect matching compact (shortly, PM-compact), if its perfect matching polytope has diameter one. This paper gives a complete characterization of simple PM-compact Hamiltonian bipartite graphs. We first define two families of graphs, called the H2C-bipartite graphs and the H23-bipartite graphs, respectively. Then we show that, for a simple Hamiltonian bipartite graph G with |V(G)| ≥ 6, G is PM-compact if and only if G is K 3,3, or G is a spanning Hamiltonian subgraph of either an H2C-bipartite graph or an H23-bipartite graph.

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Correspondence to Xiu-mei Wang.

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Supported by the National Natural Science Foundation of China under Grant No. 11101383, 11271338 and 11201432.

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Wang, Xm., Yuan, Jj. & Lin, Yx. A characterization of PM-compact Hamiltonian bipartite graphs. Acta Math. Appl. Sin. Engl. Ser. 31, 313–324 (2015). https://doi.org/10.1007/s10255-015-0475-3

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  • DOI: https://doi.org/10.1007/s10255-015-0475-3

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