摘要
本文用点态来定义开 (闭 )映射 ,并应用此定义来证明开 (闭 )映射的一些性质。
In this paper,we define open and closed mapping with aid of pointwise.By this sort definition ,we discuss properties of open and closed mapping.
出处
《青海师专学报》
2000年第3期12-13,共2页
Journal of Qinghai Junior Teachers' College