In this paper, we study the problem of rules reduction for real value information systems by using of rough set theory.

本文研究应用粗集理论对实值信息系统属性进行约简的方法。

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These rules must provide for a gradual reduction in indebtedness. They must also allow countries with high unemployment, such as Spain, to run budget deficits.

这些规则必须要求各国逐渐降低负债水平，也必须允许西班牙等高失业率国家存在预算赤字。

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Those with no rules at all managed a reduction of only 20% of GDP.

那些完全没有制定规则的只降低了20%。

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Good behavior rules and jail overcrowding guidelines add up to a sharp reduction in actual time served for county inmates, Whitmore said.

CNN: Bobby Brown goes to jail