Tutte polynomial and G-parking functions

Details Tutte polynomial and G-parking functions Tutte polynomial and G-parking functions

2008-12-15

arxiv.org/abs/0812.2817v1

Mathematics

Combinatorics

Scientific paper

Let $G$ be a connected graph with vertex set $\{0,1,2,...,n\}$. We allow $G$ to have multiple edges and loops. In this paper, we give a characterization of external activity by some parameters of $G$-parking functions. In particular, we give the definition of the bridge vertex of a $G$-parking function and obtain an expression of the Tutte polynomial $T_G(x,y)$ of $G$ in terms of $G$-parking functions. We find the Tutte polynomial enumerates the $G$-parking function by the number of the bridge vertices.

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