2. Fussy Set Theory Definition A fuzzy subset A of a universe of discourse U is characterized by a membership function which associate with each element u of U a number in the interval [0,1].

3. Definition Let U be the universe of discourse, A and B be two fussy subsets of U, and be the complement of A relative to U. Also, let u be an element of U. Then,

6. Figure 1. Fuzzy document sets for the query. Each is a conjunctive component. is the query fuzzy set.

7. Where is the membership of in the fuzzy set associated with.