
How to represent a type-2 fuzzy set(T2 FS)is a key point to deal with type-2 fuzzy control and analysis. In the paper, T2 FSs are divided into four classes: discrete T2 FSs, partially connected T2 FSs, connected T2 FSs, and compounded T2 FSs, and the corresponding representation methods are provided, especially second-degree partition of CoS is presented to represent connected T2 FS.
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