2007Combinatorics Probability ComputingRequires access

Regions Without Complex Zeros for Chromatic Polynomials on Graphs with Bounded Degree

Roberto Fernández, Aldo Procacci

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Abstract

We prove that the chromatic polynomial $P_\mathbb{G}(q)$ of a finite graph $\mathbb{G}$ of maximal degree Δ is free of zeros for |q| ≥C*(Δ) with This improves results by Sokal and Borgs. Furthermore, we present a strengthening of this condition for graphs with no triangle-free vertices.

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We prove that the chromatic polynomial $P_\mathbb{G}(q)$ of a finite graph $\mathbb{G}$ of maximal degree Δ is free of zeros for |q| ≥C*(Δ) with This improves results by Sokal and Borgs. Furthermore, we present a strengthening of this condition for graphs with no triangle-free vertices.

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OpenAlex reports 36 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

We prove that the chromatic polynomial $P_\mathbb{G}(q)$ of a finite graph $\mathbb{G}$ of maximal degree Δ is free of zeros for |q| ≥C*(Δ) with This improves results by Sokal and Borgs. Furthermore, we present a strengthening of this condition for graphs with no triangle-free vertices.

Key concepts: Chromatic polynomial, Chromatic scale, Mathematics, Degree (music), Combinatorics, Bounded function, Graph, Discrete mathematics

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