Retrieval From Fuzzy Database by Fuzzy Relational Algebra
作者： M. Umano
DOI: 10.1016/S1474-6670(17)61995-5
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摘要: Abstract The real world data may have two types of ambiguity, one is in a value itself and the other an association between values. For representing such data, we propose possibility-distribution fuzzy-relational model. In this model, former ambiguity represented by possibility distribution latter grade membership. relational algebra for fuzzy model defined. traditional operations, namely, union, intersection, difference extended Cartesian product are similarly defined as those set theory. And special projection, join, restriction division, newly databases.
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