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内容説明 The volume presents recent developments in the introduction of fuzzy， probabilistic and rough elements into basic components of fuzzy databases， and their use (notably querying and information retrieval)， from the point of view of data mining and knowledge discovery. The main novel aspect of the volume is that issues related to the use of fuzzy elements in databases， database querying， information retrieval， etc. are presented and discussed from the point of view， and for the purpose of data mining and knowledge discovery that are ?hot topics? in recent years. This may be useful for both people involved in theoretical research， education， and even the design and implementation of working computer systems.