Maximizing supermodular functions on product lattices, with application to maximum constraint satisfaction

被引:19
|
作者
Krokhin, Andrei [1 ]
Larose, Benoit [2 ]
机构
[1] Univ Durham, Dept Comp Sci, Durham DH1 3LE, England
[2] Concordia Univ, Dept Math & Stat, Montreal, PQ H3G 1M8, Canada
基金
英国工程与自然科学研究理事会;
关键词
supermodular function; lattices; optimization; tractability; constraint satisfaction;
D O I
10.1137/060669565
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
Recently, a strong link has been discovered between supermodularity on lattices and tractability of optimization problems known as maximum constraint satisfaction problems. This paper strengthens this link. We study the problem of maximizing a supermodular function which is defined on a product of n copies of a fixed finite lattice and given by an oracle. We exhibit a large class of finite lattices for which this problem can be solved in oracle-polynomial time in n. We also obtain new large classes of tractable maximum constraint satisfaction problems.
引用
收藏
页码:312 / 328
页数:17
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