Ramsey numbers and bipartite Ramsey numbers via quasi-random graphs

Ramsey numbers and bipartite Ramsey numbers via quasi-random graphs
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DOI:
10.1016/j.disc.2020.112162
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发表时间:
2021
期刊:
Discret. Math.
影响因子:
--
通讯作者:
Meng Liu-;Yusheng Li
Meng Liu-;Yusheng Li
中科院分区:
其他
文献类型:
--
作者:
Meng Liu-;Yusheng Li

文献摘要

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在本文中,我们表明,r(C 4,K t,t)≥ Ω(t3 scin2 log t)通过准随机图给出了当前最佳下限的多对数改进,这意味着r(C4,Kt)≥ Ω(t3 scin2 log t)和B r(C4,Kt,t)≥ Ω(t3 scin2 log t),其中B r(C4,Kt,t)是C4和Kt,t的二分Ramsey数.这建立在Mubayi和Verstraëte(2019)最近的突破基础上,将非对角Ramsey数减少到某些准随机图的存在。
In this paper we show that r (C 4, K t, t)≥ Ω (t 3∕ 2 log t) via quasi-random graphs giving a polylogarithmic improvement over the currently best lower bound, which implies r (C 4, K t)≥ Ω (t 3∕ 2 log t) and b r (C 4, K t, t)≥ Ω (t 3∕ 2 log t), where b r (C 4, K t, t) is the bipartite Ramsey number of C 4 and K t, t. This builds on a recent breakthrough of Mubayi and Verstraëte (2019) reducing off-diagonal Ramsey numbers to the existence of certain quasi-random graphs.