Something about the Baire Space

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I do not know why we put forward the "Baire Space"? What is the difference between the Baire Space and Metric Space? Can you give me some examples? Thank you very much!

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The concept of a Baire space is the topological generalization of the concept of a complete metric space. Specifically, complete metric spaces have the property that a countable intersection of open dense sets is still dense. (This statement is called the Baire category theorem, or at least a version of it.) Baire spaces are those topological spaces that also have this property. The most basic type of Baire space other than a complete metric space is a locally compact Hausdorff space.

For examples of why we would care, I'd suggest you look up applications of the Baire category theorem. I could state some interesting results of this type but it would probably not be obvious to you where the Baire category theorem enters into their proofs.