周友成.关于θ-加细性[J].数学研究及应用,1983,3(4):27~30 |
关于θ-加细性 |
On θ-refinability |
投稿时间:1982-07-26 |
DOI:10.3770/j.issn:1000-341X.1983.04.007 |
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英文摘要: |
In this paper the preimage problem and hereditarily of θ-refinability are discussed.The main results are as followsi (1) The preimage of weakly δθ-refinable (δθ-refinable, weakly θ-refinable) space under a continuous closed mapping with f-1(y) Lindelof is weakly δθ-refinable (δθ-refinable, weakly θ-refinable) space; (2) The θ-refinable space with closed Gδ is a hereditarily θ-refinable space. |
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