Anti-Ramsey Numbers of Subdivided Graphs

Anti-Ramsey Numbers of Subdivided Graphs
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DOI:
10.1006/jctb.2001.2105
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发表时间:
2002-06
期刊:
J. Comb. Theory B
影响因子:
--
通讯作者:
T. Jiang
T. Jiang
中科院分区:
其他
文献类型:
--
作者:
T. Jiang

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给定一个正整数n和一个图族F,反Ramsey数f(n,F)是Kn的一个边染色中的最大颜色数,使得Kn中属于F的所有子图的边都没有不同的颜色. Turan数x(n,F)是不包含F的成员作为子图的n-顶点图的最大边数。埃尔多?s等人(1975年,在Colloq. Math. Soc. Janos Bolyai,第10卷,第10页)。633?643,North-Holland,Amsterdam)证明了对于所有的图H,f(n,H)?ex(n,H)=o(n ~ 2),其中H={H?e:e?E(H)}。我们加强了他们的结果,一类图中的每一个边缘是事件的度为2的顶点。我们证明f(n,H)?当H属于这个类时,ex(n,H)=O(n)。这是从一个新的上界f(n,H),我们证明了所有的图H和渐近确定某些图H的f(n,H)。
Given a positive integer n and a family F of graphs, the anti-Ramsey numberf(n, F) is the maximum number of colors in an edge-coloring of Kn such that no subgraph of Kn belonging to F has distinct colors on its edges. The Turan numberex(n, F) is the maximum number of edges of an n-vertex graph that does not contain a member of F as a subgraph. P. Erdo?s et al. (1975, in Colloq. Math. Soc. Janos Bolyai, Vol. 10, pp. 633?643, North-Holland, Amsterdam) showed for all graphs H that f(n, H)?ex(n, H)=o(n2), where H={H?e:e?E(H)}. We strengthen their result for the class of graphs in which each edge is incident to a vertex of degree two. We show that f(n, H)?ex(n, H)=O(n) when H belongs to this class. This follows from a new upper bound on f(n, H) that we prove for all graphs H and asymptotically determines f(n, H) for certain graphs H.