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  • 标题:A Separator Theorem for Hypergraphs and a CSP-SAT Algorithm
  • 本地全文:下载
  • 作者:Michal Koucky ; Vojtech Rodl ; Navid Talebanfard
  • 期刊名称:Electronic Colloquium on Computational Complexity
  • 印刷版ISSN:1433-8092
  • 出版年度:2019
  • 卷号:2019
  • 页码:1-11
  • 出版社:Universität Trier, Lehrstuhl für Theoretische Computer-Forschung
  • 摘要:

    We show that for every r 2 there exists 0"> r 0 such that any r -uniform hypergraph on m edges with bounded vertex degree has a set of at most ( 2 1 − r ) m edges the removal of which breaks the hypergraph into connected components with at most m 2 edges. We use this to give a satisfiability algorithm for n -variable ( d k ) -CSPs in which every variable appears in at most r constraints in time d (1 − r ) n where r depends only on r , provided that k is small enough as a function of m . We will also show that unsatisfiable (2 k ) -CSPs with variable frequency r can be refuted in tree-like resolution in size 2 (1 − r ) n . Furthermore for Tseitin formulas on graphs with degree at most k (which are (2 k ) -CSPs) we give a deterministic algorithm finding such a refutation.

  • 关键词:CSP ; hypergraph ; satisfiability algorithm ; Separator ; SETH
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