{4,5} is not coverable : a counterexample to a conjecture of Kaiser and Skrekovski

{4,5} is not coverable : a counterexample to a conjecture of Kaiser and Skrekovski
复制标题

{4,5} 不可覆盖:Kaiser 和 Skrekovski 猜想的反例

DOI:
10.1137/120877817
复制
发表时间:
2013
期刊:
SIAM J. Discrete Math
影响因子:
--
通讯作者:
K. Yoshimoto
K. Yoshimoto
中科院分区:
--
文献类型:
--
作者:
R. Cada;S. Chiba;K. Ozeki;P. Vrana;K. Yoshimoto

文献摘要

相似文献

对于正整数集合的一个子集,一个被称为-coverableif的图有一个圈(一个子图,其中所有顶点都是偶数度),它与所有的边割相交,如果所有的图都是-coverable的,则称之为becoverable。作为对支配圈猜想的一种可能的方法,Kaiser和S krekovski在[SIAM J. Discrete Math.,22(2008),pp. 861--874]这是可以覆盖的,在哪里。本文证明了存在无穷多个不可复盖的图,从而否定了Kaiser和S krekovski的猜想。
For a subsetof the set of positive integers, a graphis called-coverableifhas a cycle (a subgraph in which all vertices have even degree) which intersects all edge-cutsinwith, andis said to becoverableif all graphs are-coverable. As a possible approach to the dominating cycle conjecture, Kaiser and Škrekovski conjectured in [SIAM J. Discrete Math., 22 (2008), pp. 861--874] thatis coverable, where. In this paper, we disprove Kaiser and Škrekovski's conjecture by showing that there exist infinitely many graphs which are not-coverable.