A GENERAL L-FUZZY ROUGH SET BASED ON IMTL-ALGEBRA

Approximation operator plays a vital role in rough set theory. About the approximation operator, the three elements (the binary relation in the universe, the basis algebra and the property of approximation operators) are interactional based on the form of approximation operator. In this paper, we focus on the influence of the forth element (the form of approximation operator) on the properties of the approximation operator. Through the discussion and comparison, we find that the influence depends on the basis algebra and it still follows the constructive approach of approximation operator in 11.