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Triangular norms first appeared in the framework of probabilistic metric spaces in the work K. Menger  (see [164, 268]). It turns also out that this is a crucial operation in several fields, e.g., in fuzzy sets, fuzzy logics (see ) and their applications, but also, among other fields, in the theory of generalized measures [164, 168, 201, 217, 321] and in nonlinear differential and difference equations .
KeywordsNilpotent Element Idempotent Element Triangular Norm Multiplicative Generator Countable Extension
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