It is also shown that: 1-sequentially quotient, compactmapping is 1-sequentially covering mappings.
此外本文还证明了度量空间上的1 -序列商，紧映射是1 -序列覆盖映射。
2
In this paper, we introduce the concept of compact quotient mapping and compact quotient topology, discuss systematically their basic properties and establish some interesting results.
引进了紧商映射与紧商拓扑的概念，系统地讨论了它们的性质，得到若干有趣的结果。
3
A continuous mapping on a sequential compact set that can be continuously extended to the boundary has the same properties as on a compact set.