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The number of spanning trees of a family of 2-separable weighted graphs

Discrete Applied Mathematics, ISSN: 0166-218X, Vol: 229, Page: 154-160
2017
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Based on electrically equivalent transformations on weighted graphs, in this paper, we present a formula for computing the number of spanning trees of a family of 2-separable graphs formed from two base graphs by 2-sum operations. As applications, we compute the number of spanning trees of some special 2-separable graphs. Then comparisons are made between the number of spanning trees and the number of acyclic orientations for this family of 2-separable graphs under certain constraints. We also show that a factorization formula exists for the sum of weights of spanning trees of a special splitting graph.

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