This paper represents the analysis of known approaches for determining and representing of type-2 fuzzy sets to establish the solid conceptual framework and their types of representation. The terminology and representations of the type-2 fuzzy sets considered are the basis for deep insight into their nature and the following representations, consideration and investigation of the fundamental operations on the 2-type fuzzy sets.
the type-2 fuzzy set, fuzzy membership function, footprint of uncertainty
"Nechetkye mnozhestva typa 2. Termynolohyia y predstavlenye" ,
Information Processing Systems,