@INPROCEEDINGS { Rsds2593,
author = {Allam, A.A. and Bakeir, M.Y. and Abo-Tabl, E.A.}, 
title = {New Approach for Basic Rough Set Concepts}, 
booktitle = {Rough Sets, Fuzzy Sets, Data Mining, and Granular Computing, Part I}, 
series =  = {Lecture Notes in Artificial Intelligence}, 
volume = 3641, 
pages = {64--73}, 
publisher = {Springer-Verlag}, 
address = {Heidelberg - Berlin, Germany}, 
month = {August}, 
year = 2005, 
editor = {Slezak, Dominik and Wang, Guoying and Szczuka, Marcin and Duntsch, Ivo and Yao, Yiyu}, 
issn = {0302-9743}, 
isbn = {3-540-28653-5}, 
abstract = {The standard rough set theory has been introduced in 1982 [5]. In this paper we use a topological concepts to investigate a new definitions for the lower and upper approximation operators. This approach is a generalization for Pawlak approach and the generalizations in [2, 7, 10, 12, 13, 14, 15, 16]. Properties of the suggested concepts are obtained. Also comparison between our approach and previous approaches are given. In this case, we show that the generalized approximation space is a topological space for any reflexive relation.}, 
keywords = {approximation operators, similarity relations, rough sets, topological space, }, 
}