First-countable space
- 第一可数空间（第一可数空间是拓扑空间中的一类具有可数性质的空间，其定义为任意点都有一个可数的邻域基）
First-countable space
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abstract:
In topology, a branch of mathematics, a first-countable space is a topological space satisfying the "first axiom of countability". Specifically, a space X is said to be first-countable if each point has a countable neighbourhood basis (local base).
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WordNet