Product Operation of Grade Upper Approximation Operator and Grade Lower Approximation Operator Based on Two Parameters

Grade is an important quantitative index, and graded rough set model is an important improved rough set model. The purpose of this paper is to explore product operation of grade approximation operators. Based on logical product operation of grade approximation operators, this paper proposes product operation of grade upper approximation operator and grade lower approximation operator based on two parameters. Essence, basic structure and properties are obtained, in the model of product operation of grade upper approximation operator and grade lower approximation operator based on two parameters. Macroscopic algorithm and structural algorithm are proposed and analyzed, and they are illustrated by an example.