Affiliation:
1. 1 Zhangzhou Normal University Department of Mathematics and Information Science Zhangzhou 363000 P. R. China
2. 2 Ningde Teachers’ College Institute of Mathematics Ningde, Fujian 352100 P. R. China
3. 3 University of Helsinki Department of Mathematics Yliopistonkatu 5 Helsinki 10 Finland
Abstract
In this paper, we define the spaces with a regular base at non-isolated points and discuss some metrization theorems. We firstly show that a space X is a metrizable space, if and only if X is a regular space with a σ-locally finite base at non-isolated points, if and only if X is a perfect space with a regular base at non-isolated points, if and only if X is a β-space with a regular base at non-isolated points. In addition, we also discuss the relations between the spaces with a regular base at non-isolated points and some generalized metrizable spaces. Finally, we give an affirmative answer for a question posed by F. C. Lin and S. Lin in [7], which also shows that a space with a regular base at non-isolated points has a point-countable base.
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