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Zbl 0934.03071
Yao, Y.Y.
Constructive and algebraic methods of the theory of rough sets. (English)
[J] Inf. Sci. 109, No.1-4, 21-47 (1998). ISSN 0020-0255

Abstract approximation operators corresponding to a generalization of the classical rough set approach are discussed and compared with constructive methods to define set approximations in the rough set framework. The main results are related to axiomatization of approximation operators and conditions under which different rough algebras are defined. Some characterizations of approximation operators used by different authors are presented.
[Andrzej Skowron (Warszawa)]
MSC 2000:
*03E72 Fuzzy sets (logic)
68T30 Knowledge representation

Keywords: rough sets; approximation spaces; vague concepts; approximation operators; rough algebras

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