\(\aleph_ 0\)-spaces. (English) Zbl 0148.16701
MSC:
54D70 | Base properties of topological spaces |
54D65 | Separability of topological spaces |
54E35 | Metric spaces, metrizability |
54D70 | Base properties of topological spaces |
54D65 | Separability of topological spaces |
54E35 | Metric spaces, metrizability |