Rainbow triangles in three-colored graphs

Rainbow triangles in three-colored graphs
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三色图中的彩虹三角形

DOI:
10.1016/j.jctb.2017.04.002
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发表时间:
2014
期刊:
J. Comb. Theory B
影响因子:
--
通讯作者:
Michael Young
Michael Young
中科院分区:
--
文献类型:
--
作者:
J. Balogh;Ping Hu;Bernard Lidický;Florian Pfender;Jan Volec;Michael Young

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Erdés和Sós提出了确定n个顶点的3-边色完全图中彩虹三角形的最大数目F(n)的问题。证明了F(n)= F(a)+ F(B)+ F(c)+ F(d)+ a B c+ a B d+ a cd + B cd,其中a+ B+ c+ d= n,a,B,c,d尽可能相等.我们证明了当n足够大时,所得到的递推关系成立。我们还证明了对n= 4k的猜想,其中k≥ 0.这些结果意味着lim <$F(n)(n3)= 0.4,并确定了唯一的极限对象.在证明中,我们使用旗代数结合稳定性参数。
Erdős and Sós proposed the problem of determining the maximum number F (n) of rainbow triangles in 3-edge-colored complete graphs on n vertices. They conjectured that F (n)= F (a)+ F (b)+ F (c)+ F (d)+ a b c+ a b d+ a c d+ b c d, where a+ b+ c+ d= n and a, b, c, d are as equal as possible. We prove that the conjectured recurrence holds for sufficiently large n. We also prove the conjecture for n= 4 k for all k≥ 0. These results imply that lim⁡ F (n)(n 3)= 0.4, and determine the unique limit object. In the proof we use flag algebras combined with stability arguments.
排列中长度为 4 的单调子序列的最小数量
DOI: 10.1017/s0963548314000820
发表时间: 2014
期刊: Combinatorics, Probability and Computing
影响因子: --
作者:
BALOGH J
通讯作者: BALOGH J