Degrees and cycles in digraphs

Degrees and cycles in digraphs
复制标题

有向图中的度数和周期

DOI:
10.1016/0012-365x(82)90020-6
复制
发表时间:
1982
影响因子:
0.8
通讯作者:
M. Heydemann
M. Heydemann
中科院分区:
数学3区
文献类型:
--
作者:
M. Heydemann

文献摘要

被引文献

相似文献

本文给出了强有向图中顶点的总度的条件,这意味着存在长度至少为<$(n− 1)h <$+ 1的圈,其中n是图的顶点数,h是整数,1 <$h <$n− 1.同样的条件意味着存在一条长度为+的路。在强定向图(反对称有向图)的情况下,我们改进了这些条件。在这两种情况下,我们表明,给定的条件是最好的可能。
In this article, we give conditions on the total degrees of the vertices in a strong digraph implying the existence of a cycle of length at least⌈(n− 1) h⌉+ 1, where n is the number of vertices of the graph and h an integer, 1⩽ h⩽ n− 1. The same conditions imply the existence of a path of length⌈(n− 1) h⌉+⌈(n− 2) h⌉. In the case of strong oriented graphs (antisymmetric digraphs) we improve these conditions. In both cases, we show that the given conditions are the best possible.