首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Cycles intersecting a prescribed vertex set
Authors:Atsushi Kaneko  Akira Saito
Abstract:A graph is said to have property P(k,l)(k ? l) if for any X ∈ (Gk) there exists a cycle such that |XV(C)| = l. Obviously an n-connected graph (n ? 2) satisfies P(n,n). In this paper, we study parameters k and l such that every n-connected graph satisfies P(k,l). We show that for r = 1 or 2 every n-connected graph satisfies P(n + r,n). For r = 3, there are infinitely many 3-connected graphs that do not satisfy P(6,3). However, if n ? max{3,(2r ?1)(r + 1)}, then every n-connected graph satisfies P(n + r,n).
Keywords:
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号