On Ramsey minimal graphs

On Ramsey minimal graphs
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DOI:
10.1016/j.disc.2003.11.043
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发表时间:
2004
期刊:
Discret. Math.
影响因子:
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通讯作者:
E. Sidorowicz
E. Sidorowicz
中科院分区:
--
文献类型:
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作者:
M. Borowiecki;Mariusz Haluszczak;E. Sidorowicz

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对于图G,F和H,我们写G→(F,H)表示如果G的边用两种颜色着色,比如红色和蓝色,则红色子图包含F的副本,或者蓝色子图包含H的副本。如果对任意真子图G′ ∈ G,G →(F,H)但G′ ∈(F,H),则图G是(F,H)-极小的(Ramsey-极小的).所有(F,H)-极小图的类记为R(F,H).本文给出了两个等价定理,它们刻画了当m ≠ 3时属于R(K1,2,K1,m)的图.
For graphs G, F and H we write G→(F,H) to mean that if the edges of G are coloured with two colours, say red and blue, then the red subgraph contains a copy of F or the blue subgraph contains a copy of H. The graph G is (F,H)-minimal (Ramsey-minimal) if G→(F,H) but G′↛(F,H) for any proper subgraph G′⊆G. The class of all (F,H)-minimal graphs will be denoted by R (F,H) . In this paper we will give two equivalent theorems which characterize the graphs belonging to R (K1,2,K1,m) for m⩾3.