Covering-Based Grade Rough Fuzzy Set Models

Abstract

Based on the discussion of the covering rough set models and the overlapping information between the set and the equivalence cla ssed proposed in this paper, four kinds of covering grade rough fuzzy set models are defined and established by means of the minimum description of neighbor domain, whole n eighborhood, rule confidence and membership of the elements. It unifies the results of predecessors. In addition, their properties and relationships are discussed. Finally , an example is given.