然后在属性值约简中进一步去除与用户无关的属性，从而抽取个性化决策规则。

Secondly, during reduction of attribute values, some irrelevant attributes are further eliminated, then abstractation of personalized decision rules is accomplished.

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简要介绍了粗糙集理论中区分矩阵算法和HORAFA算法在知识约简中的应用。

In this paper, application about discernibility matrix arithmetic and HORAFA arithmetic based on the rough set theory is introduced.

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介绍了文法化简中消除无用符号和无用产生式的树型算法，并通过实例予以验证。

This paper introduces a new tree algorithm that is for deleting superfluous symbol and production in grammar, and gives a practical example to check the algorithm.

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