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UPPER AND LOWER APPROXIMATIONS OF FUZZY SETS |
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| Authors: | D. BOIXADER J. JACAS J. RECASENS |
| Affiliation: | 1. Sec. Matemàtiques i Informática , E.T.S.A.V , Pere Sena 1-15, Sant Cugat, 08190, Spain;2. Sec. Matemátiques i Informática , E.T.S.A.B , Avda. Diagonal 649, Barcelona, 08028, Spain |
| Abstract: | The upper and lower approximations of a fuzzy subset with respect to an indistinguish-ability operator are studied. Their relations with fuzzy rough sets are also investigated. |
| Keywords: | Indistinguishability operator generator observable set upper approximation lower approximation rough set closure operator fuzzy topology |