中文说明：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
English Description：
Examples of rough set reduction include finding positive domain, generating untreated discernibility matrix, simplifying discernibility matrix, finding core, and attribute reduction of processed discernibility matrix