Baire category theorem
- 贝尔纲定理：贝尔纲定理是点集拓扑学和泛函分析中的一个重要的工具。这个定理有两种形式，每一个都给出了拓扑空间是贝尔空间的充分条件。
Baire category theorem
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abstract:
The Baire category theorem is an important tool in general topology and functional analysis. The theorem has two forms, each of which gives sufficient conditions for a topological space to be a Baire space.
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