约简与核是粗糙集理论的两个重要概念，而直接由定义来计算约简与核是一个典型的NP难题。

Reduction and core are two important concepts in rough set theory, while computing reductions and core according to the definitions directly is a typical NP problem.

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本文试图寻找这个均衡解集的中心核。

This paper try to find the core of the equilibrium set.

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以原始条件属性集为起点并结合算子，通过向属性核的递减式逼近，得到属性的最小相对约简。

Acquiring optimal relative reduction by descending approach to core of attribute from original set of conditional attribute and combining with operator.

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