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论文类型：会议论文

发表时间：2009-08-14

收录刊物：EI、Scopus

卷号：6

页面范围：494-497

摘要：In order to describe complicated concepts, the concept of Y-N set is introduced. Firstly, the operations on Y-N sets such as union, intersection, difference and complement of Y-N sets are presented. Secondly, the definitions of image and preimage of a Y-N set under a mapping are given and the properties of the image and preimage are discussed. Finally, a category YNSet of Y-N sets is established and it is proved that the category YNSet is a weak topos. ? 2009 IEEE.