Title :
Rough Sets on Four-Valued Fuzzy Approximation Space
Author :
Patrascu, Vasile
Author_Institution :
Tarom Co., Bucharest-Otopeni
Abstract :
The four-valued fuzzy sets (FVFS) represent a new extension of fuzzy sets based on the Lukasiewicz four-valued logic. These sets are described by four functions: strong membership, weak membership, weak non-membership and strong non-membership. In this paper the notion of four-valued fuzzy approximation space is introduced. Rough sets on such spaces are defined and some of their properties are studied.
Keywords :
approximation theory; fuzzy set theory; multivalued logic; rough set theory; Lukasiewicz four-valued logic; four-valued fuzzy set approximation space; rough set theory; Fuzzy logic; Fuzzy sets; Informatics; Natural language processing; Rough sets; Uncertainty;
Conference_Titel :
Fuzzy Systems Conference, 2007. FUZZ-IEEE 2007. IEEE International
Conference_Location :
London
Print_ISBN :
1-4244-1209-9
Electronic_ISBN :
1098-7584
DOI :
10.1109/FUZZY.2007.4295368
