On Vizing’s Problem for Triangle-Free Graphs

  • Ross J. Kang
  • Matthieu Rosenfeld

Abstract

We prove that $\chi(G) \le \lceil (\Delta+1)/2\rceil+1$ for any triangle-free graph $G$ of maximum degree $\Delta$ provided $\Delta \ge 524$. This gives tangible progress towards an old problem of Vizing, in a form cast by Reed. We use a method of Hurley and Pirot, which in turn relies on a new counting argument of the second author.

Published
2025-10-03
Article Number
P4.3