The minimum degree of Ramsey‐minimal graphs

The minimum degree of Ramsey‐minimal graphs
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Ramsey 最小图的最小度

DOI:
10.1002/jgt.20199
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发表时间:
2007
影响因子:
0.9
通讯作者:
Kathy Lin
Kathy Lin
中科院分区:
数学3区
文献类型:
--
作者:
J. Fox;Kathy Lin

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我们记为H → G,如果图H的每一条边的2-染色都包含图G的一个单色副本。一个图H是G-极小的,如果H → G,但对H的每个真子图H′,H′ ∈ G。我们定义s(G)为最小值s,使得存在一个顶点度为s的G-极小图。我们证明了s(Kk)=(k − 1)2和s(Ka,B)= 2 min(a,B)− 1。我们还提出了几个相关的开放问题。© 2006 Wiley Periodicals,Inc. J Graph Theory 54:167-177,2007
We write H → G if every 2‐coloring of the edges of graph H contains a monochromatic copy of graph G. A graph H is G‐minimal if H → G, but for every proper subgraph H′ of H, H′ ↛ G. We define s(G) to be the minimum s such that there exists a G‐minimal graph with a vertex of degree s. We prove that s(Kk) = (k − 1)2 and s(Ka,b) = 2 min(a,b) − 1. We also pose several related open problems. © 2006 Wiley Periodicals, Inc. J Graph Theory 54: 167–177, 2007