The method of processing the uncertainty knowledge on incomplete domain

There are many reasons to cause the uncertainty of knowledge. The method of rough sets can be used to process the uncertainty knowledge caused by rough approximation´s boundary on the given domain. For some tremendous domains such as n-dimensional space, people may not fully understand and master of all information but only know some of information about it. It is difficult to get the knowledge of incomplete domain with using the limited information. With the concepts of rough membership function and rough inclusion, a method was proposed to process the uncertainty knowledge that it can be get some part knowledge of unknown sets with knowledge of known sets on the incomplete domain.