Artificial Intelligence
Polynomially solvable satisfiability problems
Information Processing Letters
Tree clustering for constraint networks (research note)
Artificial Intelligence
Journal of Automated Reasoning
Characterizing diagnoses and systems
Artificial Intelligence
A hierarchy of tractable satisfiability problems
Information Processing Letters
On Indefinite Databases and the Closed World Assumption
Proceedings of the 6th Conference on Automated Deduction
IJCAI'85 Proceedings of the 9th international joint conference on Artificial intelligence - Volume 1
Algorithms for Computing X-Minimal Models
LPNMR '01 Proceedings of the 6th International Conference on Logic Programming and Nonmonotonic Reasoning
An incremental algorithm for generating all minimal models
Artificial Intelligence
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This paper addresses the problem of computing the minimal models of a given CNF propositional theory. We present two groups of algorithms. Algorithms in the first group are efficient when the theory is almost Horn, that is, when there are few non-Horn clauses and/or when the set of all literals that appear positive in any non-Horn clause is small. Algorithms in the other group are efficient when the theory can be represented as an acyclic network of low-arity relations. Our algorithms suggest several characterizations of tractable subsets for the problem of finding minimal models.