English

Graphs with arbitrary Ramsey number and connectivity

Combinatorics 2023-11-06 v1

Abstract

The Ramsey number r(G)r(G) of a graph GG is the minimum number NN such that any red-blue colouring of the edges of KNK_N contains a monochromatic copy of GG. Pavez-Sign\'e, Piga and Sanhueza-Matamala proved that for any function nf(n)r(Kn)n\leq f(n) \leq r(K_n), there is a sequence of connected graphs (Gn)nN(G_n)_{n\in \mathbb{N}} with V(Gn)=n|V(G_n)|=n such that r(Gn)=Θ(f(n))r(G_n)=\Theta(f(n)) and conjectured that GnG_n can additionally have arbitrarily large connectivity. In this note we prove their conjecture.

Keywords

Cite

@article{arxiv.2311.01887,
  title  = {Graphs with arbitrary Ramsey number and connectivity},
  author = {Isabel Ahme and Alex Scott},
  journal= {arXiv preprint arXiv:2311.01887},
  year   = {2023}
}
R2 v1 2026-06-28T13:10:37.947Z