الفهرس 
Information system and approximation spacesOnly 14 pages are availabe for public view
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Abstract
Rough set theory ,proposed in 1982 by Zdzeslaw Pawlak ,is in a state of constant development.Its methodology is concerned with the classification and analysis of imprecise,uncertain, incomplete information and knowledge.It is considered one of the first statistical approaches in data analysis .The fundamental concept behind rough set theory is the approximation of the lower and the upper of a set. The approximation of spaces being the formal classification of knowledge regarding the interest domain.