Gallai-Ramsey numbers for multiple triangles

Gallai-Ramsey numbers for multiple triangles
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多个三角形的加莱-拉姆齐数

DOI:
10.1016/j.dam.2021.03.020
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发表时间:
2021-07
影响因子:
1.1
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;Zhu Xiutao;Chen Yaojun

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完全图的Gallai染色是一种边染色,使得没有三角形的所有边都是不同的颜色。Gallai k-着色是使用最多k种颜色的Gallai着色。给定一个整数k≥ 2,图H1,H2,.,Hk,Gallai-Ramsey数GR(H1,H2,.,Hk)是使得完全图KN的每一个Gallaik-染色都包含一个颜色为i的Hi的单色副本的最小正整数N,其中i∈{1,2,.,k}.设m G表示G的m个不相交副本的并.研究了整数t1 ≥ t2 ≥ tk ≥ 1的Gallai-Ramsey数GR(t1 K3,.,tkK 3). Chung和Graham(1983)得到了t1 = t2 = tk = 1的情况。本文对所有t1 ≥ t2 ≥ tk ≥ 1,得到了GR(t1 K3,.,tkK 3)的一个一般界,并证明了对某些ti,i∈{1,.,k},可同时得到上界和下界.
A Gallai coloring of a complete graph is an edge-coloring such that no triangle has all its edges colored differently. A Gallai k-coloring is a Gallai coloring that uses at most k colors. Given an integer k≥ 2, and graphs H 1, H 2,…, H k, the Gallai-Ramsey number G R (H 1, H 2,…, H k) is the least positive integer N such that every Gallai k-coloring of the complete graph K N contains a monochromatic copy of H i in color i for some i∈{1, 2,…, k}. Let m G denote the union of m disjoint copies of G. This paper studies the Gallai–Ramsey number G R (t 1 K 3,…, t k K 3) for all integers t 1≥ t 2≥⋯≥ t k≥ 1. The case t 1= t 2=⋯= t k= 1 was obtained by Chung and Graham (1983). In this paper, we obtain a general bound of G R (t 1 K 3,…, t k K 3) for all t 1≥ t 2≥⋯≥ t k≥ 1, and prove that both the upper and lower bounds can be attained for some t i, i∈{1,…, k}.
DOI: 10.1002/jgt.22514
发表时间: 2019-01
影响因子: 0.9
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通讯作者: Henry Liu;Colton Magnant;Akira Saito;I. Schiermeyer;Yongtang Shi
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期刊: Discret. Math.
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DOI: 10.1007/bf02579187
发表时间: 1983-09
期刊: Combinatorica
影响因子: 1.1
作者:
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通讯作者: F. Graham;R. Graham