Rough Fuzzy Distance of the Rough Fuzzy Number

Rough sets theory and fuzzy sets theory research the unperfect problem in information systems. the combination of them formed Rough fuzzy sets and Rough Fuzzy number. in this paper, defines the Rough fuzzy distance of the Rough fuzzy number. Then it discusses the nature of Rough fuzzy distance. Key words: Rough fuzzy number; Distance; Rough fuzzy Distance