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AAAI
2008
13 years 9 months ago
Abduction with Bounded Treewidth: From Theoretical Tractability to Practically Efficient Computation
Abductive diagnosis is an important method to identify explanations for a given set of observations. Unfortunately, most of the algorithmic problems in this area are intractable. ...
Georg Gottlob, Reinhard Pichler, Fang Wei
LPAR
2010
Springer
13 years 5 months ago
Counting and Enumeration Problems with Bounded Treewidth
By Courcelle's Theorem we know that any property of finite structures definable in monadic second-order logic (MSO) becomes tractable over structures with bounded treewidth. T...
Reinhard Pichler, Stefan Rümmele, Stefan Wolt...
LPNMR
2009
Springer
14 years 2 months ago
Belief Revision with Bounded Treewidth
Problems arising from the revision of propositional knowledge bases have been intensively studied for two decades. Many different approaches to revision have thus been suggested, w...
Reinhard Pichler, Stefan Rümmele, Stefan Wolt...
FOCS
2003
IEEE
14 years 21 days ago
The Complexity of Homomorphism and Constraint Satisfaction Problems Seen from the Other Side
We give a complexity theoretic classification of homomorphism problems for graphs and, more generally, relational structures obtained by restricting the left hand side structure ...
Martin Grohe
ATAL
2010
Springer
13 years 8 months ago
Pure Nash equilibria: complete characterization of hard and easy graphical games
We consider the computational complexity of pure Nash equilibria in graphical games. It is known that the problem is NP-complete in general, but tractable (i.e., in P) for special...
Albert Xin Jiang, MohammadAli Safari