ls-Ponomarev-systems与1-序列覆盖映像

ls-Ponomarev-Systems and 1-sequence-covering Images

为了寻求局部可分度量空间的映像,引入双点星sn覆盖这一概念,并借用近年来由传统的Ponomarev-system推广而得的ls-Ponomarev-system,给出了局部可分度量空间1-序列覆盖映像的一个新刻画,并且这一新刻画较以往所得相关刻画更为简洁.

In order to characterize images of locally separable metric spaces, the concept of double point - star sn - covers was introduced in this paper. By using ＂ ls - Ponomarev - system＂ which is a generalization of ＂Ponomarev - system＂. The new characterizations of 1 - sequence - covering compact images of locally separable metric spaces were given.