English

Ore- and P\'osa-type conditions for partitioning $2$-edge-coloured graphs into monochromatic cycles

Combinatorics 2023-06-27 v2 Discrete Mathematics

Abstract

In 2019, Letzter confirmed a conjecture of Balogh, Bar\'at, Gerbner, Gy\'arf\'as and S\'ark\"ozy, proving that every large 22-edge-coloured graph GG on nn vertices with minimum degree at least 3n/43n/4 can be partitioned into two monochromatic cycles of different colours. Here, we propose a weaker condition on the degree sequence of GG to also guarantee such a partition and prove an approximate version. This resembles a similar generalisation to an Ore-type condition achieved by Bar\'at and S\'ark\"ozy. Continuing work by Allen, B\"ottcher, Lang, Skokan and Stein, we also show that if deg(u)+deg(v)4n/3+o(n)\operatorname{deg}(u) + \operatorname{deg}(v) \geq 4n/3 + o(n) holds for all non-adjacent vertices u,vV(G)u,v \in V(G), then all but o(n)o(n) vertices can be partitioned into three monochromatic cycles.

Keywords

Cite

@article{arxiv.2202.06388,
  title  = {Ore- and P\'osa-type conditions for partitioning $2$-edge-coloured graphs into monochromatic cycles},
  author = {Patrick Arras},
  journal= {arXiv preprint arXiv:2202.06388},
  year   = {2023}
}

Comments

25 pages, 1 figure, final version