REPRESENTATION THEOREM OF INTERVAL-VALUED FUZZY SET
Wenyi Zeng, Yu Shi, Hongxing Li · International Journal of Uncertainty Fuzziness and Knowledge-Based Systems · 2006
In this paper, we introduce the concept of interval-valued nested set on the universal set X, propose two representation theorems and equivalent classification theorem of interval-valued fuzzy set. These works can be used in setting up the basic theory of interval-valued fuzzy set.