English

Restricted size Ramsey number for $P_3$ versus cycles

Combinatorics 2018-11-22 v2

Abstract

Let FF, GG and HH be simple graphs. We say F(G,H)F \rightarrow (G, H) if for every 22-coloring of the edges of FF there exists a monochromatic GG or HH in FF. The Ramsey number r(G,H)r(G, H) is defined as r(G,H)=min{V(F):F(G,H)}r(G, H) = min\{|V (F)|: F \rightarrow (G, H)\}, while the restricted size Ramsey number r(G,H)r^{*}(G, H) is defined as r(G,H)=min{E(F):F(G,H),V(F)=r(G,H)}r^{*}(G, H) = min\{|E (F)|: F \rightarrow (G, H) , |V (F) | = r(G, H)\}. In this paper we determine previously unknown restricted size Ramsey numbers r(P3,Cn)r^{*}(P_3, C_n) for 7n127 \leq n \leq 12. We also give new upper bound r(P3,Cn)2n2r^{*}(P_3, C_n) \leq 2n-2 for even n8n \geq 8.

Keywords

Cite

@article{arxiv.1706.08134,
  title  = {Restricted size Ramsey number for $P_3$ versus cycles},
  author = {Joanna Cyman and Tomasz Dzido},
  journal= {arXiv preprint arXiv:1706.08134},
  year   = {2018}
}