当前位置: X-MOL 学术J. Graph Theory › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Few H copies in F‐saturated graphs
Journal of Graph Theory ( IF 0.9 ) Pub Date : 2019-11-25 , DOI: 10.1002/jgt.22525
Jürgen Kritschgau 1 , Abhishek Methuku 2 , Michael Tait 3 , Craig Timmons 4
Affiliation  

A graph is F ‐saturated if it is F ‐free but the addition of any edge creates a copy of F . In this paper we study the function sat ( n , H , F ) which is the minimum number of copies of H that an F ‐saturated graph on n vertices may contain. This function is a natural saturation analogue of Alon and Shikhelman's generalized Turán problem, and letting H = K 2 recovers the well‐studied saturation function. We provide a first investigation into this general function focusing on the cases where the host graph is either K s or C k ‐saturated. Some representative interesting behavior is:
  • (a) For any natural number m , there are graphs H and F such that sat ( n , H , F ) = Θ ( n m ) .
  • (b) For many pairs k and l , we show sat ( n , C l , C k ) = 0 . In particular, we prove that there exists a triangle‐free C k ‐saturated graph on n vertices for any k > 4 and large enough n .
  • (c) sat ( n , K 3 , K 4 ) = n 2 , sat ( n , C 4 , K 4 ) n 2 2 , and sat ( n , C 6 , K 5 ) n 3 .
We discuss several intriguing problems that remain unsolved.


中文翻译:

F饱和图中的H份很少

图是 F -如果是饱和的 F -免费,但添加任何边线都会创建一个副本 F 。在本文中我们研究功能 坐着 ñ H F 这是的最小副本数 H 那一个 F 上的饱和图 ñ 顶点可能包含。此函数是Alon和Shikhelman的广义Turán问题的自然饱和度模拟, H = ķ 2 恢复经过充分研究的饱和度函数。我们针对此一般功能进行了首次调查,重点研究了主机图是 ķ s 要么 C ķ 饱和。一些代表性的有趣行为是:
  • (a)对于任何自然数 ,有图 H F 这样 坐着 ñ H F = Θ ñ
  • (b)多对 ķ ,我们展示 坐着 ñ C C ķ = 0 。特别是,我们证明存在一个无三角形的 C ķ 上的饱和图 ñ 任何顶点 ķ > 4 而且足够大 ñ
  • (C) 坐着 ñ ķ 3 ķ 4 = ñ - 2 坐着 ñ C 4 ķ 4 ñ 2 2 坐着 ñ C 6 ķ 5 ñ 3
我们讨论了几个尚未解决的有趣问题。
更新日期:2019-11-25
down
wechat
bug