On fan-wheel and tree-wheel Ramsey numbers

On fan-wheel and tree-wheel Ramsey numbers
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关于扇轮和树轮拉姆齐数

DOI:
10.1016/j.disc.2016.03.013
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发表时间:
2016-09
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 Yanbo;Broersma Hajo;Chen Yaojun

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对于图G1和G2,Ramsey数R(G1,G2)是最小整数N,使得对任一N阶图G,G包含G1作为子图或G的补包含G2为子图.设Tn表示n阶树,Wn表示n+1阶轮,Fn表示2n+1阶扇.我们建立了扇和树相对于偶数阶轮的Ramsey数,从而推广了几个已知结果.特别地,我们证明了对于奇数m≥3和n≥(5 m+3)/4,R(Fn,Wm)=6n+1;对于奇数m−3和n≥m≥2,R(Tn,Wm)=3 n−2,并证明了Tn是一棵树,对其满足ErdőS-S S猜想.
For graphs G 1 and G 2, the Ramsey number R (G 1, G 2) is the smallest integer N such that, for any graph G of order N, G contains G 1 as a subgraph or the complement of G contains G 2 as a subgraph. Let T n denote a tree of order n, W n a wheel of order n+ 1 and F n a fan of order 2 n+ 1. We establish Ramsey numbers for fans and trees versus wheels of even order, thereby extending several known results. In particular, we prove that R (F n, W m)= 6 n+ 1 for odd m≥ 3 and n≥(5 m+ 3)/4, and that R (T n, W m)= 3 n− 2 for odd m≥ 3 and n≥ m− 2, and T n being a tree for which the Erdős–Sós Conjecture holds.
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