English

Ramsey and Gallai-Ramsey numbers for two classes of unicyclic graphs

Combinatorics 2018-09-28 v1

Abstract

Given a graph GG and a positive integer kk, define the \emph{Gallai-Ramsey number} to be the minimum number of vertices nn such that any kk-edge coloring of KnK_n contains either a rainbow (all different colored) triangle or a monochromatic copy of GG. In this paper, we consider two classes of unicyclic graphs, the star with an extra edge and the path with a triangle at one end. We provide the 22-color Ramsey numbers for these two classes of graphs and use these to obtain general upper and lower bounds on the Gallai-Ramsey numbers.

Keywords

Cite

@article{arxiv.1809.10298,
  title  = {Ramsey and Gallai-Ramsey numbers for two classes of unicyclic graphs},
  author = {Zhao Wang and Yaping Mao and Colton Magnant and Jinyu Zou},
  journal= {arXiv preprint arXiv:1809.10298},
  year   = {2018}
}

Comments

17 pages. arXiv admin note: text overlap with arXiv:1802.04930