Disjoint cycles and chorded cycles in a graph with given minimum degree

Disjoint cycles and chorded cycles in a graph with given minimum degree
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图中具有给定最小度数的不相交循环和弦循环

DOI:
10.1016/j.disc.2020.111837
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发表时间:
2020
影响因子:
0.8
通讯作者:
Yeager, Elyse
Yeager, Elyse
中科院分区:
数学3区
文献类型:
--
作者:
Molla, Theodore;Santana, Michael;Yeager, Elyse

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1963年Corrádi和Hajnal解决了Erdős的一个猜想,证明了在至少3r个顶点上最小度至少为2r的图包含r个不相交环的集合,2008年Finkel证明了在至少4s个顶点上最小度至少为3s的图包含s个不相交环的集合。同年,Bialostocki、Finkel和Gyárfás对这一定理进行了推广:每个至少有3r + 4s个顶点,最小度至少为2r + 3s的图都包含r+ s个不相交环的集合,其中s个是有弦的。Chiba et al.(2010)证实并进一步强化了这一猜想。在本文中,我们刻画了在至少3r + 4s个顶点上的所有图,这些顶点的最小度至少为2r + 3s−1,它们不包含r+ s个不相交环的集合,其中s个环是有弦的。此外,我们给出了r+ s不相交环存在的最小度阈值的一个猜想,其中s个环有弦,我们证明了这个猜想的一个近似版本。
In 1963, Corrádi and Hajnal settled a conjecture of Erdős by showing that every graph on at least 3 r vertices with minimum degree at least 2 r contains a collection of r disjoint cycles, and in 2008, Finkel proved that every graph with at least 4 s vertices and minimum degree at least 3 s contains a collection of s disjoint chorded cycles. The same year, a generalization of this theorem was conjectured by Bialostocki, Finkel, and Gyárfás: every graph with at least 3 r+ 4 s vertices and minimum degree at least 2 r+ 3 s contains a collection of r+ s disjoint cycles, s of them chorded. This conjecture was settled and further strengthened by Chiba et al.(2010). In this paper, we characterize all graphs on at least 3 r+ 4 s vertices with minimum degree at least 2 r+ 3 s− 1 that do not contain a collection of r+ s disjoint cycles, s of them chorded. In addition, we provide a conjecture regarding the minimum degree threshold for the existence of r+ s disjoint cycles, s of them chorded, and we prove an approximate version of this conjecture.
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