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This paper is concerned with the extension and the belief revision in Reiter's default reasoning. First we introduce a new notion of pseudo extension which is successively constructed from a given def...ault theory. We show that the set of pseudo extensions contains the set of extensions, so that we can get some reasonable candidates of extension in a constructive way. This should be a first step towards computerization of the default reasoning. We also discuss the belief revision problem from the viewpoint of Shapiro's inductive inference of models.show more
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