Do nearly balanced multigraphs have more spanning trees?
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Let di the degree of the ith vertex of a mutigraph and λij be the number of edges between vertex i and vertex j. A multigraph is called nearly balanced if |di − di| ≤1 for all i ≠i′ and |λij −λij| for all i and all j,j′ Let be the collection of all the multigraphs with v vertices and e edges. It is shown that for any v, there is an e* such that if, then any nearly balanced graph in ζv, e has more spanning trees than any non-nearly-balanced graph in ζv, e.
[1] Ching-Shui Cheng,et al. Maximizing the total number of spanning trees in a graph: Two related problems in graph theory and optimum design theory , 1981, J. Comb. Theory B.
[2] D. R. Shier,et al. Maximizing the number of spanning trees in a graph with n nodes and m edges , 1974 .
[3] A. Kelmans,et al. A certain polynomial of a graph and graphs with an extremal number of trees , 1974 .
[4] I. Olkin,et al. Inequalities: Theory of Majorization and Its Applications , 1980 .