利用集合之间的包含度概念,讨论了覆盖决策信息系统的覆盖决策约简、覆盖分布约简、最大覆盖分布约简之间的关系,讨论了不协调覆盖决策信息系统中覆盖上、下近似约简的刻画及它们与覆盖分布约简、最大覆盖分布约简之间的关系。这些结果推广和深化了决策信息系统约简理论。
By using inclusion degree between sets, the relationships among covering decision reduction, covering distribution reduction and the largest covering distribution reduction about covering decision information system are discussed. Also the characterizations of covering upper and lower approximation reduction about inconsistent covering decision information system and their relationships to covering distribution reduction and the largest covering distribution reduction are studied. The results generalize and deepen the reduction theories of decision information system.