Search for: [Abstract = "Type\-2 fuzzy sets are used for modeling uncertainty and imprecision in a better way. These type\-2 fuzzy sets were originally presented by Zadeh in 1975 and are essentially “fuzzy fuzzy” sets where the fuzzy degree of membership is a type\-1 fuzzy set. The new concepts were introduced by Mendel and Liang allowing the characterization of a type\-2 fuzzy set with a superior membership function and an inferior membership function\; these two functions can be represented each one by a type\-1 fuzzy set membership function. The interval between these two functions represents the footprint of uncertainty \(FOU\), which is used to characterize a type\-2 fuzzy set."]

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