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Electronic Journal of Combinatorics
Article . 2014 . Peer-reviewed
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Electronic Journal of Combinatorics
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https://dx.doi.org/10.48550/ar...
Article . 2013
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Chromatic Bounds on Orbital Chromatic Roots

Chromatic bounds on orbital chromatic roots
Authors: Dae Hyun Kim 0005; Alexander H. Mun; Mohamed Omar;

Chromatic Bounds on Orbital Chromatic Roots

Abstract

Given a group $G$ of automorphisms of a graph $\Gamma$, the orbital chromatic polynomial $OP_{\Gamma,G}(x)$ is the polynomial whose value at a positive integer $k$ is the number of orbits of $G$ on proper $k$-colorings of $\Gamma.$ Cameron and Kayibi introduced this polynomial as a means of understanding roots of chromatic polynomials. In this light, they posed a problem asking whether the real roots of the orbital chromatic polynomial of any graph are bounded above by the largest real root of its chromatic polynomial. We resolve this problem in a resounding negative by not only constructing a counterexample, but by providing a process for generating families of counterexamples. We additionally begin the program of finding classes of graphs whose orbital chromatic polynomials have real roots bounded above by the largest real root of their chromatic polynomials; in particular establishing this for many outerplanar graphs.

Related Organizations
Keywords

Coloring of graphs and hypergraphs, 05C15, 05C30, 05C31, Graph polynomials, FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO), Enumeration in graph theory

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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