Rainbow saturation of graphs
Rainbow saturation of graphs
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DOI:
10.1002/jgt.22532
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发表时间:
2017-10
影响因子:
0.9
通讯作者:
António Girão;David Lewis;Kamil Popielarz
中科院分区:
文献类型:
--
作者:
António Girão;David Lewis;Kamil Popielarz
In this paper, we study the following problem proposed by Barrus, Ferrara, Vandenbussche, and Wenger. Given a graph H and an integer t , what is satt(n,R(H)) , the minimum number of edges in a t ‐edge‐colored graph G on n vertices such that G does not contain a rainbow copy of H , but adding to G a new edge in any color from {1,2,…,t} creates a rainbow copy of H ? Here, we completely characterize the growth rates of satt(n,R(H)) as a function of n , for any graph H belonging to a large class of connected graphs and for any t≥e(H) . This classification includes all connected graphs of minimum degree 2. In particular, we prove that satt(n,R(Kr))=Θ(nlogn) , for any r≥3 and t≥r2 , thus resolving a conjecture of Barrus, Ferrara, Vandenbussche, and Wenger. We also pose several new problems and conjectures.