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).
@article{urn:eudml:doc:38867, title = {Fuzzy sets as set classes.}, journal = {Stochastica}, volume = {6}, year = {1982}, pages = {249-264}, zbl = {0519.94018}, mrnumber = {MR0705766}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:38867} }
Sales, Ton. Fuzzy sets as set classes.. Stochastica, Tome 6 (1982) pp. 249-264. http://gdmltest.u-ga.fr/item/urn:eudml:doc:38867/