Regions Without Complex Zeros for Chromatic Polynomials on Graphs with Bounded Degree
Roberto Fernández, Aldo Procacci
Abstract
Roberto Fernández, Aldo Procacci
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.
Key concepts: Chromatic polynomial, Chromatic scale, Mathematics, Degree (music), Combinatorics, Bounded function, Graph, Discrete mathematics