Formalizing nonmonotonic reasoning systems
Artificial Intelligence
Fixed points in the propositional nonmonotonic logic
Artificial Intelligence
Default theories that always have extensions
Artificial Intelligence
Tractable Reasoning in Artificial Intelligence
Tractable Reasoning in Artificial Intelligence
Introduction to Default Logic
Reasoning with Incomplete Information
Reasoning with Incomplete Information
Nonmonotonic Logic: Context-Dependent Reasoning
Nonmonotonic Logic: Context-Dependent Reasoning
Adding Priorities and Specificity to Default Logic
JELIA '94 Proceedings of the European Workshop on Logics in Artificial Intelligence
CSL '94 Selected Papers from the 8th International Workshop on Computer Science Logic
A Tableau-Based Theorem Prover for a Decidable Subset of Default Logic
Proceedings of the 10th International Conference on Automated Deduction
Truth Maintenance Systems for Problem Solving
Truth Maintenance Systems for Problem Solving
How to prefer more specific defaults in terminological default logic
IJCAI'93 Proceedings of the 13th international joint conference on Artifical intelligence - Volume 1
Forming concepts for fast inference
AAAI'92 Proceedings of the tenth national conference on Artificial intelligence
Toward efficient default reasoning
AAAI'96 Proceedings of the thirteenth national conference on Artificial intelligence - Volume 1
AAAI'96 Proceedings of the thirteenth national conference on Artificial intelligence - Volume 1
Well-Founded Semantics for Default Logic
Fundamenta Informaticae
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In Reiter's default logic, the operator in the fixed-point definition of extension is not appropriate to compute extensions by its iterated applications. This paper presents a class of alternative operators, called compatible ones, such that, at least for normal default theories and so-called well-founded, ordered default theories, we can get extensions by iterated applications of them. In addition, we completely answer Etherington's conjectures about both his procedure for generating extensions and a modified version of it. In particular, we give an example of a finite, ordered default theory, for which the original procedure fails to converge, and show that the computation of the modified one is essentially the iteration of a compatible operator and converges for finite, ordered theories.