Descriptive set theory | Topological spaces | Integer sequences

Baire space (set theory)

In set theory, the Baire space is the set of all infinite sequences of natural numbers with a certain topology. This space is commonly used in descriptive set theory, to the extent that its elements are often called "reals". It is denoted NN, ωω, by the symbol or also ωω, not to be confused with the countable ordinal obtained by ordinal exponentiation. The Baire space is defined to be the Cartesian product of countably infinitely many copies of the set of natural numbers, and is given the product topology (where each copy of the set of natural numbers is given the discrete topology). The Baire space is often represented using the tree of finite sequences of natural numbers. The Baire space can be contrasted with Cantor space, the set of infinite sequences of binary digits. (Wikipedia).

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Cantor space | Uniform convergence | Set theory | Countable set | Continued fraction | Isolated point | Topology | Continuous function | Gδ set | Base (topology) | Transfer operator | Unit interval | Perfect set | Baire space | Sequence | Uniform space | Descriptive set theory | Complex plane | Ordinal arithmetic | Cylinder set | Dense set | Real analysis | Tree (descriptive set theory) | Gauss–Kuzmin–Wirsing operator | Natural number | Set (mathematics) | Meagre set | Cartesian product | Binary digit | Polish space | Shift operator | Haar measure | Automorphism group | Irrational number | Subspace topology | Cardinality | Complete metric space | Box topology | Product topology