计算机科学与探索 ›› 2009, Vol. 3 ›› Issue (6): 641-648.DOI: 10.3778/j.issn.1673-9418.2009.06.009

• 学术研究 • 上一篇    下一篇

MAX-k-SAT的PTAS归约等价性

许道云+,秦永彬   

  1. 贵州大学 计算机科学系,贵阳 550025
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-11-15 发布日期:2009-11-15
  • 通讯作者: 许道云

Equivalence of PTAS Reduction for MAX-k-SAT

XU Daoyun+, QIN Yongbin   

  1. Department of Computer Science, Guizhou University, Guiyang 550025, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-11-15 Published:2009-11-15
  • Contact: XU Daoyun

摘要: 通过构造适当的极小不可满足公式,利用子句拼接技术,引入了一个一般化的从k-CNF公式(k≥3)到3-CNF公式之间的归约转换。基于该转换,给出了一个真值指派的转换算法,并证明了MAX-k-SAT与MAX-3-SAT是PTAS归约等价的。因此,对于kt≥3,MAX-k-SAT与MAX-t-SAT是PTAS归约等价的。

关键词: 极小不可满足公式, 归约, MAX-k-SAT问题, PTAS等价

Abstract: By constructing proper minimal unsatisfiable formulas and concatenating clauses, a general reduction transformation from k-CNF formulas (k≥3) to 3-CNF formulas is introduced. Based on this transformation, present an algorithm for the transformation of truth assignments, and show that MAX-k-SAT is PTAS (polynomial-time approximation scheme) equivalent to MAX-3-SAT. Thus, MAX-k-SAT is PTAS equivalent to MAX-t-SAT for kt≥3.

Key words: minimal unsatisfiable formula, reduction, MAX-k-SAT problem, PTAS equivalence

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