Trees with depression three

被引:4
|
作者
Mynhardt, C. M. [1 ]
机构
[1] Univ Victoria, Dept Math & Stat, Victoria, BC V8W 3P4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
edge ordering; increasing path; monotone path; depression;
D O I
10.1016/j.disc.2007.07.039
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
An edge ordering of a graph G = (V, E) is an injection f : E --> N. A (simple) path for which f increases along its edge sequence is an f-ascent, and a maximal f-ascent if it is not contained in a longer f-ascent. The depression of G is the least integer k such that every edge ordering of G has a maximal ascent of length at most k. We characterise trees with depression three. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:855 / 864
页数:10
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