摘要
提出了物元等价类概念，并利用子集合X和属性子集R对物元集合S（U．A，V，f）在集合论域U上构造了一类可拓集合^-A，并讨论了^-A关于X和R的一些相关性质。
In this paper, the concept of matter-element equivalent set is introduced. And by use of the subset X and its characteristic subset R, a kind of extension set ^-A is formed on the base of metter-element set S（U,A ,V,f）, and some properties of ^-A on X and R are discussed.
出处
《数学的实践与认识》
CSCD
北大核心
2006年第1期227-231,共5页
Mathematics in Practice and Theory
关键词
物元
可拓集
关联函数
正域
matter-element
extension set
correlation function
positive region
