Real zeros of $w$-polynomials: cycles and complete cutsets

Hongyue Tang; Lily Li Liu

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arXiv · 2611.00912

Real zeros of $w$-polynomials: cycles and complete cutsets

Hongyue Tang·Lily Li Liu

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Abstract

For a simple graph $G$ with $n$ vertices, its $w$-polynomial is defined by \begin{align*} \sum_{q\geq0}P(G;q)x^q =\frac{w(G;x)}{(1-x)^{n+1}}, \end{align*} where $P(G;x)$ is the chromatic polynomial of $G$. This polynomial was introduced by Brenti in 1992. In this paper, we prove Conjecture~6.7 and the $w$-assertion of Conjecture~6.5 posed by Brenti, Royle and Wagner in 1994. The first states that $w(C_n;x)$ has only real zeros for $n\ge 5$. The second assertion states that if $G\cap H$ is complete and both $w(G;x)$ and $w(H;x)$ have only real zeros, then $w(G\cup H;x)$ has only real zeros.

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BibTeX RIS

Hongyue Tang, Lily Li Liu. 2026-10-31. Real zeros of $w$-polynomials: cycles and complete cutsets. https://arxiv.org/abs/2611.00912

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