second-countable space

topological space whose topology admits a countable base

en-GB/sɪˈkɒnd - ˈkaʊntəbl ˈspeɪs/
en-US/ˈsɛkənd - ˈkaʊntəbəl ˈspeɪs/

分类：

separable spacefirst-countable spaceLindelöf space