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A Combinatorial Proof of the Rayleigh Formula for Graphs

. Discrete Mathematics, 308 (24): 5944--5953 (2008)
DOI: 10.1016/j.disc.2007.11.011

Abstract

Rayleigh monotonicity in Physics has a combinatorial interpretation. In this paper we give a combinatorial proof of the Rayleigh formula using the Jacobi Identity and the all-minors matrix tree Theorem. Motivated by the fact that the edge set of each spanning tree of G is a basis of the graphic matroid induced by G , we define the Rayleigh monotonicity of the generating polynomial for the set of bases of a matroid and suggest a few related problems.

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