Fréchet Quasi-Bases and the Closed Images of Metric Spaces
Received:December 16, 1998  
Key Words: Frechet quasi-base   cs*-network   sequential network   closed map   s-mapping  
Fund Project:
Author NameAffiliation
LI Jin-jin Dept
of Math
Zhangzhou Teachers' College
Fujian
China 
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Abstract:
      In this paper the concept of Frechet quasi-base, which is introduced by Lin Shou, is used, some new characterizations of the certain closed images of metric spaces and locally separable metric spaces arc obtained,
Citation:
DOI:10.3770/j.issn:1000-341X.2001.04.020
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