Generalized hypertree decompositions: np-hardness and tractable variants

  • Authors:
  • Georg Gottlob;Zoltan Miklos;Thomas Schwentick

  • Affiliations:
  • University of Oxford;University of Oxford;University of Dortmund

  • Venue:
  • Proceedings of the twenty-sixth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
  • Year:
  • 2007

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Abstract

The generalized hypertree width GHW(H) of a hypergraph H is a measure of its cyclicity. Classes of conjunctive queries or constraint satisfaction problems whose associated hypergraphs have bounded GHW are known to be solvable in polynomial time. However,it has been an open problem for several years if for a fixed constant k and input hypergraph H it can be determined in polynomial time whether GHW(H)