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PODS
2007
ACM
159views Database» more  PODS 2007»
14 years 4 months ago
Generalized hypertree decompositions: np-hardness and tractable variants
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 hypergr...
Georg Gottlob, Thomas Schwentick, Zoltán Mi...
IJCAI
2007
13 years 5 months ago
Backtracking Procedures for Hypertree, HyperSpread and Connected Hypertree Decomposition of CSPs
Hypertree decomposition has been shown to be the most general CSP decomposition method. However, so far the exact methods are not able to find optimal hypertree decompositions of...
Sathiamoorthy Subbarayan, Henrik Reif Andersen