English

The Johansson--Molloy Theorem for DP-Coloring

Combinatorics 2019-06-04 v5

Abstract

The aim of this note is twofold. On the one hand, we present a streamlined version of Molloy's new proof of the bound χ(G)(1+o(1))Δ(G)/lnΔ(G)\chi(G) \leq (1+o(1))\Delta(G)/\ln \Delta(G) for triangle-free graphs GG, avoiding the technicalities of the entropy compression method and only using the usual "lopsided" Lov\'asz Local Lemma (albeit in a somewhat unusual setting). On the other hand, we extend Molloy's result to DP-coloring (also known as correspondence coloring), a generalization of list coloring introduced recently by Dvo\v{r}\'ak and Postle.

Keywords

Cite

@article{arxiv.1708.03843,
  title  = {The Johansson--Molloy Theorem for DP-Coloring},
  author = {Anton Bernshteyn},
  journal= {arXiv preprint arXiv:1708.03843},
  year   = {2019}
}

Comments

10 pages, 1 figure; v5: Minor changes following referees' suggestions