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Twofold fuzzy sets and rough sets - some issues in knowledge representation. (English) Zbl 0633.68099
The paper deals with the problem of set representation for which the membership status of an element cannot be determined (like in fuzzy sets). The paper presents together with the twofold fuzzy sets operations, a definition of the cardinality of these types of sets. Twofold fuzzy relation, as well as the other concepts introduced, are used by the authors in approximate reasoning, as well as in knowledge representation.
Reviewer: C.Kevorchian

MSC:
68T99 Artificial intelligence
03E72 Theory of fuzzy sets, etc.
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