Gallai-Ramsey number of even cycles with chords

Gallai-Ramsey number of even cycles with chords
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加莱-拉姆齐和弦的偶数循环数

DOI:
10.1016/j.disc.2021.112738
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发表时间:
2022-03
影响因子:
0.8
通讯作者:
Chen Yaojun
Chen Yaojun
中科院分区:
数学3区
文献类型:
--
作者:
Zhang Fangfang;Song Zi-Xia;Chen Yaojun

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对于图H和整数k≥ 1,k-色Ramsey数Rk(H)是使得完全图KN的边的每一个k-着色都包含H的单色副本的最小整数N.设Cm表示m≥ 4个顶点上的圈,θ m表示由Cm通过添加连接两个不连续顶点的附加边而得到的图族.与奇圈的Ramsey数不同,关于Rk(C2 n)的一般性态知之甚少,只知道对所有k≥ 2和n≥ 2,Rk(C2 n)≥(n− 1)k+ n+ k− 1。本文研究了具有弦的偶数圈在Gallai染色下的Ramsey数,其中Gallai染色是指不含彩虹三角形的完全图的边的染色。对于整数k≥ 1,图H的Gallai-Ramsey数GRk(H)是使得完全图KN的每一个Gallaik-染色都包含H的单色副本的最小正整数N.我们证明了当k≥ 2,n≥ 3时,GRk(Θ 2 n)=(n− 1)k+ n+ 1.这意味着G R k(C 2 n)=(n− 1)k+ n+ 1所有k≥ 2且n≥ 3。我们的结果给出了至少四个顶点上的所有偶数圈的Gallai-Ramsey数的统一证明。
For a graph H and an integer k≥ 1, the k-color Ramsey number R k (H) is the least integer N such that every k-coloring of the edges of the complete graph K N contains a monochromatic copy of H. Let C m denote the cycle on m≥ 4 vertices and let Θ m denote the family of graphs obtained from C m by adding an additional edge joining two non-consecutive vertices. Unlike Ramsey number of odd cycles, little is known about the general behavior of R k (C 2 n) except that R k (C 2 n)≥(n− 1) k+ n+ k− 1 for all k≥ 2 and n≥ 2. In this paper, we study Ramsey number of even cycles with chords under Gallai colorings, where a Gallai coloring is a coloring of the edges of a complete graph without rainbow triangles. For an integer k≥ 1, the Gallai-Ramsey number G R k (H) of a graph H is the least positive integer N such that every Gallai k-coloring of the complete graph K N contains a monochromatic copy of H. We prove that G R k (Θ 2 n)=(n− 1) k+ n+ 1 for all k≥ 2 and n≥ 3. This implies that G R k (C 2 n)=(n− 1) k+ n+ 1 all k≥ 2 and n≥ 3. Our result yields a unified proof for the Gallai-Ramsey number of all even cycles on at least four vertices.
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