"A finite set of possibly fuzzy instructions which define a fuzzy set in terms of other fuzzy sets (and possibly itself, i.e. recursively) or constitute a procedure for computing the grade of membership of any element of the universe of discourse in the set under definition" (LA ZADEH, 1973b, p.40).
ZADEH explains: "In the latter case, the definitional algorithm plays the role of an identificational algorithm, that is an algorithm which identifies whether or not an element belongs to a set or, more generally, determines its grade of membership" (p.40).
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Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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