对于一般的子集系统Z,引入了Z-极小集的概念,给出了Z-连续偏序集中保Z-极小集与保Z-并和<<Z间的等价刻划及其有关性质,得到了关于保Z-极小集映射的扩张定理.
For a general subset system Z , the concept of Z- minimal sets is defined , some characteristics of Z- continuous posets are discussed, the equivalent characterizations between the mapping preserving the Z- minimal sets and the mapping preserving 〈〈Z and the Z- supremum of Z- continuous posets are given, so the corresponding extension theorem is made.