【摘 要】
：
The concept of a consistent approximation representation space is introduced.Many types of information systems can be treated and unified as consistent approxim
【机 构】
：
Institute for Information and System Sciences,School of Management,Information College
【基金项目】
：
国家自然科学基金;国家重点基础研究发展计划(973计划)
论文部分内容阅读
The concept of a consistent approximation representation space is introduced.Many types of information systems can be treated and unified as consistent approximation representation spaces. At the same time, under the framework of this space, the judgment theorem for determining consistent attribute set is established,from which we can obtain the approach to attribute reductions in information systems. Also, the characterizations of three important types of attribute sets (the core attribute set, the relative necessary attribute set and the unnecessary attribute set)are examined.
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