Fuzzy subgroups commutativity degree of dihedral groups
  In this paper we introduce and study the concept of distinct fuzzy subgroups commutativity degree of a finite group G. This quantity measures the probability of two random distinct fuzzy subgroups of G commuting. We determine distinct fuzzy subgroup commutativity degree for some of finite groups. 
Hassan Naraghi and Hosein Naraghi
math.GM