English

Excluding subdivisions of bounded degree graphs

Combinatorics 2022-05-10 v4

Abstract

Let HH be a fixed graph. What can be said about graphs GG that have no subgraph isomorphic to a subdivision of HH? Grohe and Marx proved that such graphs GG satisfy a certain structure theorem that is not satisfied by graphs that contain a subdivision of a (larger) graph H1H_1. Dvo\v{r}\'ak found a clever strengthening---his structure is not satisfied by graphs that contain a subdivision of a graph H2H_2, where H2H_2 has "similar embedding properties" as HH. Building upon Dvo\v{r}\'ak's theorem, we prove that said graphs GG satisfy a similar structure theorem. Our structure is not satisfied by graphs that contain a subdivision of a graph H3H_3 that has similar embedding properties as HH and has the same maximum degree as HH. This will be important in a forthcoming application to well-quasi-ordering.

Keywords

Cite

@article{arxiv.1407.4428,
  title  = {Excluding subdivisions of bounded degree graphs},
  author = {Chun-Hung Liu and Robin Thomas},
  journal= {arXiv preprint arXiv:1407.4428},
  year   = {2022}
}
R2 v1 2026-06-22T05:05:46.641Z