You may find elements in the two next articles:
- D. Dubois & H. Prade, " TOWARDS FUZZY DIFFERENCIAL CALCULUS PART 3: DIFFERENCIATION" Fuzzy Sets & Systems 8 (1982) 225-233
- D. Dubois & H. Prade, "On Several Definitions of the Differencial of a Fuzzy Mapping" Fuzzy Sets and systems 24 (1987) 117-120
Hope this will be usefull
Yassar
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