2-Factors in claw-free graphs with locally disconnected vertices

2-Factors in claw-free graphs with locally disconnected vertices
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具有局部断开顶点的无爪图中的 2 因子

DOI:
10.1007/s10587-015-0177-2
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发表时间:
2015-06
影响因子:
0.5
通讯作者:
Tian Runli
Tian Runli
中科院分区:
数学4区
文献类型:
--
作者:
An Mingqiang;Xiong Liming;Tian Runli

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如果G的边不在G的任何三角形上,则G的边是奇异的;否则,它是非奇异的。图G的一个顶点称为局部连通的,如果由它的邻域诱导的子图G[N(U)]是连通的,否则称为局部连通的.本文证明了如果一个连通的无爪图G阶至少3满足以下两个条件:(I)对每个至少3度的局部不连通的顶点,存在一个非负整数,使得它位于一个至少有4条非奇异边且至少有-5个局部连通顶点的诱导圈上;(Ii)对于每一个2次局部不连通的顶点,都有一个非负整数使得它位于一个诱导圈C上,且至少有-3个局部连通顶点,且G[V(C)∩V2(G)]是路或圈,则G有一个2-因子,在某种意义上它是最好的。这一结果推广了Faudree,Faudree和Ryjáček(2008年)和Ryjáček,Xong和Yoshimoto(2010年)的两个已知结果。
An edge ofGis singular if it does not lie on any triangle ofG; otherwise, it is non-singular. A vertexuof a graphGis called locally connected if the induced subgraphG[N(u)] by its neighborhood is connected; otherwise, it is called locally disconnected.In this paper, we prove that if a connected claw-free graphGof order at least three satisfies the following two conditions: (i) for each locally disconnected vertexvof degree at least 3 inG, there is a nonnegative integerssuch thatvlies on an induced cycle of length at least 4 with at mostsnon-singular edges and with at leasts-5 locally connected vertices; (ii) for each locally disconnected vertexvof degree 2 inG, there is a nonnegative integerssuch thatvlies on an induced cycleCwith at mostsnon-singular edges and with at leasts-3 locally connected vertices and such thatG[V(C)∩V2(G)] is a path or a cycle, thenGhas a 2-factor, and it is the best possible in some sense. This result generalizes two known results in Faudree, Faudree and Ryjáček (2008) and in Ryjáček, Xiong and Yoshimoto (2010).
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