Separators for Planar Graphs that are Almost Trees
Linda Cai, Sariel Har-Peled, Simiao Ye·2018-08-08·via cs.DS updates on arXiv.org
We prove that a connected planar graph with $n$ vertices and $n+μ$ edges has a vertex separator of size $O( \sqrtμ + 1)$, and this separator can be computed in linear time.