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the fever. About two weeks ago the fever ceased. Temporal Constmint Networks are a well-known He is positive about do not having fever at the time powerful formalism for encoding temporal knowfie pain in the back started. Answering a specific edge based on the CSP techniques. It has question from the physician, the patient recalls he been recentIy proposed a redefinition of Met-ate goat cheese a little longer than one month ago. ric temporal constraints to cope with vagueness He is sure that it was not more than 49 days. of temporal relations based on fuzzy sets, called We are interested in describing uncertain and vague fizzy Temporal Constraint Networks.In this paper we identify those queries on a fuzzy temporal constraint network relevant to a knowledge-based reasoning system, we provide definitions for their answering and explore the functions on which they are based by discussing the different choices for them. These results can be useful to those interested in defining a system for temporal reasoning under uncertainty. For instance, we satisfactorily applied them to the definition of a possibilistic tempoml reasoning system.

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