arXiv:2611.11280 · v1

Impropriety and resilience of the chromatic number

首次提交 2026-11-08 18:07

版本更新 2026-11-08 18:07

雷达观测 2026-11-10 12:16

摘要

We show that, for $p$ bounded away from $1$ and $np\to\infty$, the chromatic number of the binomial random graph $G_{n,p}$ is resilient to removal of a subgraph $H$ with $o(n \log(np))$ edges. It follows that the same assertion holds with $H$ being a subgraph of maximum degree $o(\log(np))$; and both these results are best possible up to a constant factor. We also prove corresponding results for the random $r$-regular graph $G_{n,r}$, when $r\to\infty$ and $r/n$ is bounded away from $1$, where $H$ has $o(n\log r)$ edges or maximum degree $o(\log r)$. Our results rely on a natural connection between chromatic resilience to edge removal and improper graph colouring. This work provides counterpoint to the work of Sudakov and Vu (2008) and Alon and Sudakov (2010), which treated chromatic resilience for $G_{n,p}$ subject to the addition, rather than removal, of edges.

作者备注：22 pages