Semantical considerations on nonmonotonic logic
Artificial Intelligence
A guide to completeness and complexity for modal logics of knowledge and belief
Artificial Intelligence
Modal nonmonotonic logics: ranges, characterization, computation
Journal of the ACM (JACM)
A note on non-monotonic modal logic
Artificial Intelligence
Handbook of logic in artificial intelligence and logic programming (vol. 1)
Handbook of logic in artificial intelligence and logic programming (vol. 1)
Handbook of logic in artificial intelligence and logic programming (vol. 1)
Modal logic
Nonmonotonic Logic: Context-Dependent Reasoning
Nonmonotonic Logic: Context-Dependent Reasoning
CSL '90 Proceedings of the 4th Workshop on Computer Science Logic
Reasoning About Knowledge
A tractable knowledge representation service with full introspection
TARK '88 Proceedings of the 2nd conference on Theoretical aspects of reasoning about knowledge
On a Modal Epistemic Axiom Emerging from McDermott-Doyle Logics
Fundamenta Informaticae
Relating truth, knowledge and belief in epistemic states
ECSQARU'11 Proceedings of the 11th European conference on Symbolic and quantitative approaches to reasoning with uncertainty
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Stable belief sets were introduced by R. Stalnaker in the early '80s, as a formal representation of the epistemic state for an ideal introspective agent. This notion motivated Moore's autoepistemic logic and greatly influenced modal nonmonotonic reasoning. Stalnaker stable sets possess an undoubtly simple and intuitive definition and can be elegantly characterized in terms of S5 universal models or KD45 situations. However, they do model an extremely perfect introspective reasoner and suffer from a Knowledge Representation (KR) version of the logical omniscience problem. In this paper, we vary the context rules underlying the positive and/or negative introspection conditions in the original definition of R. Stalnaker, to obtain variant notions of a stable epistemic state, which appear to be more plausible under the epistemic viewpoint. For these alternative notions of stable belief set, we obtain representation theorems using possible world models with non-normal (impossible) worlds and neighborhood modal models.