ECAI 2004 Conference Paper

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Plausibility structures for default reasoning

Yves Moinard

Friedman and Halpern have introduced the inference by plausibility structures, which provides semantics for various default logics. This is a generalization of known inferences, such as those based on expectations, or on possibilistic logic. We argue that a slightly different inference by plausibility would be more appropriate for default reasoning. It would still be appropriate for all the default logics considered by Friedman and Halpern. Significant cases, such as subsets of normal defaults with multiple extensions, or a formalism extending circumscription to the cases where (AND) is falsified, can be translated into the new formalism only. In order to prove our results, we complete the list of the reasoning properties for the (two versions of the) inference by plausibility. Since these properties describe the behavior of a given inference in an intuitive and non technical way, this list is important for any potential user. Moreover, it happens that considering these properties only, without going into the technicalities of the plausibility approach, is enough to describe the main results given here.

Keywords: Default logics;, common sense knowledge;

Citation: Yves Moinard: Plausibility structures for default reasoning. In R.López de Mántaras and L.Saitta (eds.): ECAI2004, Proceedings of the 16th European Conference on Artificial Intelligence, IOS Press, Amsterdam, 2004, pp.853-857.


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ECAI-2004 is organised by the European Coordinating Committee for Artificial Intelligence (ECCAI) and hosted by the Universitat Politècnica de València on behalf of Asociación Española de Inteligencia Artificial (AEPIA) and Associació Catalana d'Intel-ligència Artificial (ACIA).