Fuzzy sets as set classes.
Stochastica, Tome 6 (1982) no. 3, p. 249.

Voir la notice de l'article dans European Digital Mathematics Library

Fuzzy sets have been studied in various forms. We now offer a presentation of fuzzy sets whereby they are conceived as representatives of a whole class of sets (that are themselves subsets of the universe of objects on which the fuzzy set is defined).
Classification : 94D05, 03E72
Mots-clés : Conjuntos difusos, fuzzy set, plausibility, set classes, Shafer's belief operation 
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     author = {Ton Sales},
     title = {Fuzzy sets as set classes.},
     journal = {Stochastica},
     pages = {249},
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     zbl = {0519.94018},
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Ton Sales. Fuzzy sets as set classes.. Stochastica, Tome 6 (1982) no. 3, p. 249. https://geodesic-test.mathdoc.fr/item/STO_1982__6_3_38867/