Type-2 fuzzy sets and systems

Type-2 fuzzy sets and systems extend the concept of traditional (or Type-1) fuzzy sets by incorporating uncertainty in the membership values themselves. In a Type-1 fuzzy set, each element has a single membership value that ranges between 0 and 1, representing the degree to which that element belongs to the set. In contrast, a Type-2 fuzzy set allows for a range of membership values, providing a way to handle more complex forms of uncertainty.