On the Generalization of Variable Precision Covering Rough Set Model

Based on majority inclusion relation and error parameter β(0≤β0.5),the generalized variable precision rough set model was proposed with the help of successor neighbor.The basic properties of approximation operators were investigated.Two pairs of dual approximation operators apc'β(X)and apc'β(X)together with apc″β(X)and apc″β(X)were proposed from generalizing apcβ(X)and apcβ(X).Finally,the properties of two pairs of dual approximation operators were discussed,the relationship among these approximation operators were analyzed in detail.