【摘要】 利用粗糙集约简的辨识矩阵,给出属性是核心元素的充要条件为该属性是辨识矩阵中单元素集.利用上近似与下近似给出了判断是否核心元素的两个充分条件,指出利用核心元素简化决策树比用熵函数ID3方法简化的决策树更简单.更多还原

【Abstract】 The sufficient and necessary conditions of the core elements in attributes using reductions from the discernibility matrix of rough set is given. They are the sets with only a single element. Two sufficient conditions are obtained by lower and upper approximations. The results showing that the decision-tree by the core elements is simpler than that by the method ID₃ with entropy function.更多还原