Based on the classification of mathematical knowledge, this paper pointed out the characteristic of good mathematical cognitive structure and its instructional enlightment.
文章根据在数学知识分类的基础上提出的良好的数学认知结构所具备的特征，由此得出相应的教学启示。
Rough set theory is a mathematical tool to deal with incomplete and uncertain knowledge, it can reduce knowledge under maintained the same classification ability of decision table.
粗糙集理论是一种处理不完整性和不确定性知识的数学工具，能够在保持决策表分类能力不变的情况下，进行知识的约简。
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