约简与核是粗集中的两个重要概念，它具有重要的应用。
Reduction and core are two important concepts and significantly applied in rough set.
在对分类与归并性质充分研究的基础上，探讨了条件分类、约简与核的层次关系。
According to the properties of partition and merging, the hierarchy relation among condition classification, reduction and core is studied.
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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