Random directed graphs are robustly Hamiltonian

Random directed graphs are robustly Hamiltonian
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随机有向图具有稳健的哈密顿量

DOI:
10.1002/rsa.20631
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发表时间:
2016
影响因子:
1
通讯作者:
Hefetz D
Hefetz D
中科院分区:
数学3区
文献类型:
--
作者:
Hefetz D

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Ghouila-Houri在1960年提出的一个经典定理证明了n个顶点的有向图中至少包含一个有向汉密尔顿圈,其中n个顶点的出度和入度都最小.本文将这一定理推广到随机有向图,即任意有序对(u,v)成为概率p独立于其他所有有序对的弧的有向图。受随机图弹性性质研究的启发,我们证明了,如果,则a.a.s.的每一个具有最小出度和入度的子有向图至少包含一个有向汉密尔顿圈.常数1/2是渐近最佳可能的。我们的结果也加强了经典的结果存在的有向汉密尔顿圈的随机有向图。© 2016 Wiley Periodicals,Inc.随机结构算法,49,345-362,2016
A classical theorem of Ghouila‐Houri from 1960 asserts that every directed graph onnvertices with minimum out‐degree and in‐degree at least contains a directed Hamilton cycle. In this paper we extend this theorem to a random directed graph , that is, a directed graph in which every ordered pair (u, v) becomes an arc with probabilitypindependently of all other pairs. Motivated by the study of resilience of properties of random graphs, we prove that if , then a.a.s. every subdigraph of with minimum out‐degree and in‐degree at least contains a directed Hamilton cycle. The constant 1/2 is asymptotically best possible. Our result also strengthens classical results about the existence of directed Hamilton cycles in random directed graphs. © 2016 Wiley Periodicals, Inc. Random Struct. Alg., 49, 345–362, 2016
在密集图和有向图中计算和打包汉密尔顿循环
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