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:
影响因子:
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通讯作者:
Meng Liu-;Yusheng Li
中科院分区:
文献类型:
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作者:
Meng Liu-;Yusheng Li
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.