σ-Locally finite family of sets and σ-images of metric spaces
Qingdong Wang · 2006
The relation between the σ-images of metrizable spaces and spaces with σ-locally finite cs-network,or spaces with σ-locally finite cs~*-network,or spaces with σ-sequential neighborthood network,or spaces with σ-locally finite sequential open network are established by use of σ-mapping.