Journal of Logic Programming
Semantical considerations on nonmonotonic logic
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The extended closed world assumption and its relationship to parallel circumscription
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Nonmonotonic logics and their algebraic foundations
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The purpose of this paper is to investigate the relationship between two approaches to the formalization of non-monotonic reasoning - J. McCarthy's approach based on the notion of Circumscription [Mc] and the Autoepistemic Logic approach of R. Moore [Mr]. Since these two approaches differ considerably in scope, we will limit our attention to the situation where some common ground can be found. Namely, we consider only the propositional case of parallel circumpsription, when all predicates of a formula T are circumscribed simultaneously.