In fuzzy set theory the membership function of a fuzzy set is a classical function A : X → [0, 1]. In some applications the shape of the membership function is itself uncertain. This problem appears mainly because of the subjectivity of expert knowledge and imprecision of our models. In these situations we can use a higher order extension of fuzzy set theory.
CITATION STYLE
Bede, B. (2013). Extensions of Fuzzy Set Theory (pp. 193–199). https://doi.org/10.1007/978-3-642-35221-8_10
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