粗糙集约简的例子，求正域、生成未经处理的区分矩阵、对区分矩阵进行化简、求核、对已经处理过的区分矩阵进行属性约简-Rough intensive Jane, for example, generating positive field of untreated discernibility matrix, to distinguish matrix of reduction, for nuclear, to have treated discernibility matrix for attrib