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On Sequence-Covering Compact Mappings
Shou LIN(1),Peng Fei YAN(2)
Acta Mathematica Sinica, Chinese Series
2001, 44 (1):
175-182.
DOI: 10.12386/A2001sxxb0023
In this paper authors use the concepts of cs-networks, sequential-neighbor- hood networks, sequential-open networks and weak bases, discuss the relations among point-regular covers, uniform covers and point-star networks of point-finite covers in spaces, and establish the characterizations of images of metric spaces under some sequence-covering (compact) mappings. In particular, it is shown that the image of metric spaces under sequence-covering (or 1-sequence-covering) compact mappings is equivalent to the space with point-regular cs-networks, which answers a Tanaka's question.
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