arXiv:2611.14194 · v1

You Can Have It All: Small sparse induced-universal graphs for minor-closed classes

首次提交 2026-11-10 23:15

版本更新 2026-11-10 23:15

雷达观测 2026-11-11 13:08

摘要

We show that, for every fixed proper minor-closed graph class $\mathcal{G}$ and every positive integer $n$, there exists a graph $U_n$ with $n^{1+o(1)}$ vertices and edges such that every $n$-vertex graph in $\mathcal{G}$ is isomorphic to an induced subgraph of $U_n$. This result generalizes and unifies the results of Dujmović et al. (J. ACM 2021) on induced-universal graphs and the results of Esperet, Joret, and Morin (J. London Math. Soc. 2023) on sparse induced-universal graphs from planar graphs to all proper minor-closed graph classes. It simultaneously improves the previous bounds for the number of vertices in induced-universal graphs (previously $O(n^2)$ obtained as a corollary of a result of DeVos et al. (J. Comb. Theory, Ser. {B} 2004) and a result of Gavoille and Labourel (ESA 2007)) and the number of edges in subgraph-universal graphs (previously $O(n^{3/2})$ by Babai et al. (Theory and Practice of Combinatorics 1982)).

作者备注：Extends the results in arXiv:2605.06616 to produce induced-universal graphs with $n^{1+o(1)}$ edges and vertices