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arXiv · 0904.4819

The independence polynomial of a graph at -1

Vadim E. Levit·Eugen Mandrescu
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Abstract

If alpha=alpha(G) is the maximum size of an independent set and s_{k} equals the number of stable sets of cardinality k in graph G, then I(G;x)=s_{0}+s_{1}x+...+s_{alpha}x^{alpha} is the independence polynomial of G. In this paper we prove that: 1. I(T;-1) equels either -1 or 0 or 1 for every tree T; 2. I(G;-1)=0 for every connected well-covered graph G of girth > 5, non-isomorphic to C_{7} or K_{2}; 3. the absolute value of I(G;-1) is not greater than 2^nu(G), for every graph G, where nu(G) is its cyclomatic number.

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Vadim E. Levit, Eugen Mandrescu. 2009-04-30. The independence polynomial of a graph at -1. https://arxiv.org/abs/0904.4819

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