Approximations in hypergroups and fuzzy hypergroups
The first part of this paper represents a continuation of the study of approximations in a hypergroup. We analyse the lower and upper approximations of a subset in a hypergroup, with respect to some operators, particularly the completeness operator. In the last part, we introduce and analyse the lower and upper approximation of a subset in a fuzzy hypergroup.
hypergroup fuzzy hypergroup completeness operator rough set complete part invertible fuzzy subhypergroup