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Fuzzy relation-based models for handling uncertainty (in a non-probabilistic way) in diagnosis problems have been introduced by Sanchez about 20 years ago, and since then applied and developed by several researchers. The paper first reviews the existing proposals, also including the association-based abductive model proposed by Reggia and his co-workers, which uses non-fuzzy relations. A new model...
Fuzzy relational structures, built with the aid of fuzzy sets and fuzzy relations, constitute a fundamental class of constructs arising in fuzzy set theory. They give rise to fuzzy relation equations. In this paper we will develop the concepts of single and multilevel relational structures. Different logic operations will be discussed in detail. Aspects of the knowledge representation will be studied...
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