具有σ局部有限sn网的正则空间称为sn可度量化空间.本文讨论了k半层空间的可扩性质,证明了序列覆盖的闭映射保持sn可度量化空间,同时给出与sn可度量化空间的映射性质相关的几个例子.%A space is called an sn-metrizable space if it is a regular space with a σ-locally finite sn-network. In this paper an expandable property of k-semistritifiable spaces is discussed, it is shown that sn-metrizability is preserved by closed sequence-covering mappings,and some related examples of mapping properties on sn-metrizable spaces are given.
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