Frédéric Havet ; Andrew King - List circular backbone colouring

dmtcs:1258 - Discrete Mathematics & Theoretical Computer Science, March 1, 2014, Vol. 16 no. 1 -
List circular backbone colouringArticle

Authors: Frédéric Havet ORCID1; Andrew King 2

  • 1 Combinatorics, Optimization and Algorithms for Telecommunications
  • 2 Departments of mathematics and computing science

A natural generalization of graph colouring involves taking colours from a metric space and insisting that the endpoints of an edge receive colours separated by a minimum distance dictated by properties of the edge. In the q-backbone colouring problem, these minimum distances are either q or 1, depending on whether or not the edge is in the backbone. In this paper we consider the list version of this problem, with particular focus on colours in ℤp - this problem is closely related to the problem of circular choosability. We first prove that the list circular q-backbone chromatic number of a graph is bounded by a function of the list chromatic number. We then consider the more general problem in which each edge is assigned an individual distance between its endpoints, and provide bounds using the Combinatorial Nullstellensatz. Through this result and through structural approaches, we achieve good bounds when both the graph and the backbone belong to restricted families of graphs.

Volume: Vol. 16 no. 1
Section: Graph Theory
Published on: March 1, 2014
Accepted on: July 23, 2015
Submitted on: January 17, 2013
Keywords: Discrete Mathematics, Graph Theory,[INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM]
    Source : OpenAIRE Graph
  • Funder: Natural Sciences and Engineering Research Council of Canada

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