Fuzzy databases make use of fuzzy set theory. In this theory, any subset ? of a universe ? is represented by a characteristic function ?? that maps ? to _________________. For every element ? ∈ ?, the...

Fuzzy databases make use of fuzzy set theory. In this theory, any subset ? of a universe ? is represented

by a
characteristic function
?? that maps ? to _________________. For every element ? ∈ ?, the value

??(?) is interpreted as the
degree of confidence
that ? ∈ ?.

1. the set {0,1}


2. the interval 0,1


3. the set ℜ of all real numbers


4. the set ℤ of all integers