摘要
在非空集合的子集簇中引入一种自映射边界运算，以此为基础建立拓扑空间的概念。
The concept of mappingboundary operation is introduced in a nonempty set,from which,a topology on X is structured.Furthermore,the equivalence between the image of a subset under boundary operation,and the boundary set of the same subset is discussed.
