English

On the size Ramsey number of all cycles versus a path

Combinatorics 2020-05-19 v1

Abstract

We say G(C,Pn)G\to (\mathcal{C}, P_n) if GE(F)G-E(F) contains an nn-vertex path PnP_n for any spanning forest FGF\subset G. The size Ramsey number R^(C,Pn)\hat{R}(\mathcal{C}, P_n) is the smallest integer mm such that there exists a graph GG with mm edges for which G(C,Pn)G\to (\mathcal{C}, P_n). Dudek, Khoeini and Pra{\l}at proved that for sufficiently large nn, 2.0036nR^(C,Pn)31n2.0036n \le \hat{R}(\mathcal{C}, P_n)\le 31n. In this note, we improve both the lower and upper bounds to 2.066nR^(C,Pn)5.25n+O(1).2.066n\le \hat{R}(\mathcal{C}, P_n)\le 5.25n+O(1). Our construction for the upper bound is completely different than the one considered by Dudek, Khoeini and Pra{\l}at. We also have a computer assisted proof of the upper bound R^(C,Pn)7519n+O(1)<3.947n\hat{R}(\mathcal{C}, P_n)\le \frac{75}{19}n +O(1) < 3.947n .

Keywords

Cite

@article{arxiv.2005.08075,
  title  = {On the size Ramsey number of all cycles versus a path},
  author = {Deepak Bal and Ely Schudrich},
  journal= {arXiv preprint arXiv:2005.08075},
  year   = {2020}
}

Comments

13 pages, 3 figures