On approximating tree spanners that are breadth first search trees

被引:3
|
作者
Papoutsakis, Ioannis [1 ]
机构
[1] Kastelli Pediados, Iraklion 70006, Crete, Greece
关键词
Tree spanner; Low stretch; Hardness of approximation; Spanning tree; Distance; COMPLEXITY; GRAPHS;
D O I
10.1016/j.jcss.2016.02.008
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
There are known efficient algorithms that approximate the minimum t for which a graph admits a tree t-spanner with ratio O(log n). Unless there is an algorithm that decides 3-SAT in quasi-polynomial time, it is impossible to approximate efficiently the minimum t for which a graph admits a tree t-spanner that is a breadth first search tree starting from a given vertex with ratio almost o(log n). (C) 2016 Elsevier Inc. All rights reserved.
引用
收藏
页码:817 / 825
页数:9
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