介绍了粗糙集数据约简概念，包括相对约简和绝对约简，并将它们统一为差别列表上的集合操作，其中差别列表是从差别矩阵引伸而来的。

The problems of data reduction, including relative reduction and absolute reduction are introduced and unified as the set operation on difference list that is come from the difference matrix.

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介绍了粗糙集数据约简概念，包括相对约简和绝对约简，并将它们统一为差别列表上的集合操作，其中差别列表是从差别矩阵引伸而来的。

The problems of data reduction, including relative reduction and absolute reduction are introduced and unified as the set operation on difference list that is come from the difference matrix.

youdao