Ramsey numbers of trees versus fans

Ramsey numbers of trees versus fans
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拉姆齐树木数量与球迷数量

DOI:
10.1016/j.disc.2015.01.030
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发表时间:
2015-06
影响因子:
0.8
通讯作者:
Yaojun Chen
Yaojun Chen
中科院分区:
数学3区
文献类型:
--
作者:
Yanbo Zhang;Hajo Broersma;Yaojun Chen

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对于给定的两个图G1和G2,Ramsey数R(G1,G2)是最小的整数N,使得对于任意N阶图G,要么G包含G1作为子图,要么G的补图包含G2作为子图.设Tn是n阶树,Sn是n阶星星,Fm是2 m+ 1阶扇,即m个三角形恰好共享一个顶点.本文证明了R(Tn,Fm)= 2 n− 1,其中n≥ 3 m2 − 2 m− 1,若Tn = Sn,则值域可以用n≥ max {m(m− 1)+ 1,6(m− 1)}代替,这在某种意义上是紧的.
For two given 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, either G contains G 1 as a subgraph or the complement of G contains G 2 as a subgraph. Let T n be a tree of order n, S n a star of order n, and F m a fan of order 2 m+ 1, ie, m triangles sharing exactly one vertex. In this paper, we prove that R (T n, F m)= 2 n− 1 for n≥ 3 m 2− 2 m− 1, and if T n= S n, then the range can be replaced by n≥ max {m (m− 1)+ 1, 6 (m− 1)}, which is tight in some sense.
DOI: 10.1007/bf02018466
发表时间: 1973-03
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