然而，知识约简离不开一系列的算法作支撑，包括判断属性的重要性、求核、属性约简和值约简等。
However, knowledge reduction is dependent on a series of supporting algorithms such as the calculation of attribute significance, finding core, attribute reduction and value reduction.
文中指出属性约简的作用，及其涉及到的一个重要概念——属性核的概念和重要性。
Attempts to point out the role of attribute reduction and analyze an important conception concerned and its importance-attribute core.
区分矩阵和区分函数是求核和约简的有力工具。
Discernibility matrix and discernibility function are a powerful tool seeking nuclear attributes and attribute reduction.
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