English

On the size-Ramsey number of tight paths

Combinatorics 2017-12-12 v1

Abstract

For any r2r\geq 2 and k3k\geq 3, the rr-color size-Ramsey number R^(G,r)\hat R(\mathcal{G},r) of a kk-uniform hypergraph G\mathcal{G} is the smallest integer mm such that there exists a kk-uniform hypergraph H\mathcal{H} on mm edges such that any coloring of the edges of H\mathcal{H} with rr colors yields a monochromatic copy of G\mathcal{G}. Let Pn,k1(k)\mathcal{P}_{n,k-1}^{(k)} denote the kk-uniform tight path on nn vertices. Dudek, Fleur, Mubayi and R\H{o}dl showed that the size-Ramsey number of tight paths R^(Pn,k1(k),2)=O(nk1α(logn)1+α)\hat R(\mathcal{P}_{n,k-1}^{(k)}, 2) = O(n^{k-1-\alpha} (\log n)^{1+\alpha}) where α=k2(k12)+1\alpha = \frac{k-2}{\binom{k-1}{2}+1}. In this paper, we improve their bound by showing that R^(Pn,k1(k),r)=O(rk(nlogn)k/2)\hat R(\mathcal{P}_{n,k-1}^{(k)}, r) = O(r^k (n\log n)^{k/2}) for all k3k\geq 3 and r2r\geq 2.

Keywords

Cite

@article{arxiv.1712.03247,
  title  = {On the size-Ramsey number of tight paths},
  author = {Linyuan Lu and Zhiyu Wang},
  journal= {arXiv preprint arXiv:1712.03247},
  year   = {2017}
}

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9 pages