English

Tree decompositions and many-sided separations

Combinatorics 2022-07-25 v1

Abstract

A separation of a graph GG is a partition (A1,A2,C)(A_1, A_2, C) of V(G)V(G) such that A1A_1 is anticomplete to A2A_2. A classic result from Robertson and Seymour's Graph Minors Project states that there is a correspondence between tree decompositions and laminar collections of separations. A many-sided separation of a graph GG is a partition (A1,,Ak,C)(A_1, \ldots, A_k, C) of V(G)V(G) such that AiA_i is anticomplete to AjA_j for all 1i<jk1 \leq i < j \leq k. In this note, we show a correspondence between tree decompositions with a certain parity property, called deciduous tree decompositions, and laminar collections of many-sided separations.

Keywords

Cite

@article{arxiv.2207.10778,
  title  = {Tree decompositions and many-sided separations},
  author = {Tara Abrishami},
  journal= {arXiv preprint arXiv:2207.10778},
  year   = {2022}
}
R2 v1 2026-06-25T01:07:58.698Z