arXiv:2611.11513 · v1

Induced-Minor-Free Graphs Admit a Star-Based Separator of Size $\tilde{O}(\sqrt{n})$

首次提交 2026-11-09 01:38

版本更新 2026-11-09 01:38

雷达观测 2026-11-10 13:19

摘要

Given an $H$-induced-minor-free graph $G$ with $n$ vertices, we construct a balanced separator of $G$ consisting of $\tilde{O}(|V(H)|\sqrt{n})$ star subgraphs. Our result is an induced-minor-free analog of the famous separator theorem for $H$-minor-free graphs by Alon, Seymour, and Thomas [J. Amer. Math. Soc., 1990]. A key idea in our construction is a new decomposition of $H$-induced-minor-free graphs, analogous to the cop decomposition for $H$-minor-free graphs by Andreae [J. Combin. Theory Ser. B, 1986]. We also discuss several algorithmic applications of our result.