On coloring numbers of graph powers

H. A. Kierstead, Daqing Yang, Junjun Yi

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The weak r-coloring numbers wcolr(G) of a graph G were introduced by the first two authors as a generalization of the usual coloring number col(G), and have since found interesting theoretical and algorithmic applications. This has motivated researchers to establish strong bounds on these parameters for various classes of graphs. Let Gp denote the pth power of G. We show that, all integers p>0 and Δ≥3 and graphs G with Δ(G)≤Δ satisfy col(Gp)∈O(p⋅wcol⌈p∕2⌉(G)(Δ−1)⌊p∕2⌋); for fixed tree width or fixed genus the ratio between this upper bound and worst case lower bounds is polynomial in p. For the square of graphs G, we also show that, if the maximum average degree 2k−2<mad(G)≤2k, then col(G2)≤(2k−1)Δ(G)+2k+1.

Original languageEnglish (US)
Article number111712
JournalDiscrete Mathematics
Volume343
Issue number6
DOIs
StatePublished - Jun 2020

Keywords

  • Coloring number
  • Graph power
  • Harmonious Strategy
  • Maximum average degree
  • Square of graphs
  • Weak coloring number

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Discrete Mathematics and Combinatorics

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