Titlebook: An Introduction to Default Logic; Philippe Besnard Book 1989 Springer-Verlag Berlin Heidelberg 1989 Default Logic.Extension.Künstliche Int

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978-3-642-08078-4Springer-Verlag Berlin Heidelberg 1989

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https://doi.org/10.1007/978-3-322-84159-9soning do not come under the realm of first order logic. These deficiencies have been the motivation for non classical logics (for instance modal logics [Lewis and Langford 1959] and relevance logic [Anderson and Belnap 1975]). In particular, nonmonotonic logics [Bobrow 1980] were introduced after i

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https://doi.org/10.1007/978-3-322-84159-9s some kind of nonmonotonic inference rules called defaults. Returning to Example 4.2.1, we know that, given any bird, a good policy is to believe that the bird is able to fly until a proof to the contrary, if any, can be established. Such common sense knowledge can be expressed by the default . whi

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https://doi.org/10.1007/978-3-322-84159-9 this name for the whole logic. They have attacked from various angles the way extensions are defined in default logic; one of them, Łukaszewicz [1984b], building on his diagnosis of the reason why extensions sometimes do not exist, has proposed an alternative view of the notion of extensions, one b

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https://doi.org/10.1007/978-3-322-84159-9s that the world to be modelled can only be partially represented. The description of all propositions that are not true in the world to be modelled, which corresponds to an enormous collection of information, is highly problematic. An attractive solution is to make such knowledge implicit, by virtu