A new covering rough fuzzy set model

The covering rough fuzzy set model as one of the extension models of rough set theory combining with fuzzy set theory is an important issue in rough set theory. It has more general approximation space than the models based on partition. It focuses on the upper and lower approximation of fuzzy sets with the knowledge of covering, which is of great significance to the decision for some purposes. Although three types of covering rough fuzzy set models have been given, all these models have some deficiencies. In this paper, we propose a new reasonable covering rough fuzzy set mode, and then discuss its some relative properties.