Fuzzy division in fuzzy relational databases: an approach

An approach to calculate the relational division in fuzzy databases is pres ented, starting with the GEFRED model. The tuples of the division are obtai ned with a possibility degree that indicates the extent to which they compl y with the relational division requisites. The results obtained are those e xpected a priori. Furthermore, in order to formalize this method of fuzzy r elational division, two new operators are defined which may be useful in ot her operations: the qualified fuzzy intersection and the generalized fuzzy projection with group functions. Some examples are included in order to cla rify the method proposed here and the defined operators. A comparison with other fuzzy division approaches that appear in the literature is included t oo. (C) 2001 Elsevier Science B.V. All rights reserved.