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Small 1-defective Ramsey numbers in perfect graphs
Discrete Optimization ( IF 0.9 ) Pub Date : 2019-06-18 , DOI: 10.1016/j.disopt.2019.06.001
Tınaz Ekim , John Gimbel , Oylum Şeker

In this paper, we initiate the study of defective Ramsey numbers for the class of perfect graphs. Let PG be the class of all perfect graphs and R1PG(i,j) denote the smallest n such that all perfect graphs on n vertices have either a 1-dense i-set or a 1-sparse j-set. We show that R1PG(3,j)=j for any j2, R1PG(4,4)=6, R1PG(4,5)=8, R1PG(4,6)=10, R1PG(4,7)=13, R1PG(4,8)=15 and R1PG(5,5)=13. We exhibit all extremal graphs for R1PG(4,7)=13 (there are exactly three). We also obtain the 1-defective Ramsey number of order (4,7) in triangle-free perfect graphs, namely R1ΔPG(4,7)=12.



中文翻译:

完美图中的小1缺陷Ramsey数

在本文中,我们开始研究一类完善的图的有缺陷的Ramsey数。让PG 成为所有完美图的一类, [R1个PG一世Ĵ 表示最小 ñ 这样所有的完美图 ñ 顶点具有1密度 一世集或1-稀疏 Ĵ-组。我们证明[R1个PG3Ĵ=Ĵ 对于任何 Ĵ2[R1个PG44=6[R1个PG45=8[R1个PG46=10[R1个PG47=13[R1个PG48=15[R1个PG55=13。我们展示了所有的极值图[R1个PG47=13(正好有三个)。我们还获得了无三角形完美图中1阶次的有缺陷Ramsey数(4,7),即[R1个ΔPG47=12

更新日期:2019-06-18
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