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- Fσ_set abstract "In mathematics, an Fσ set (said F-sigma set) is a countable union of closed sets. The notation originated in France with F for fermé (French: closed) and σ for somme (French: sum, union).In metrizable spaces, every open set is an Fσ set. The complement of an Fσ set is a Gδ set. In a metrizable space, any closed set is a Gδ set.The union of countably many Fσ sets is an Fσ set, and the intersection of finitely many Fσ sets is an Fσ set. Fσ is the same as in the Borel hierarchy.".
- Fσ_set wikiPageID "396575".
- Fσ_set wikiPageRevisionID "592935474".
- Fσ_set subject Category:Descriptive_set_theory.
- Fσ_set subject Category:Topology.
- Fσ_set comment "In mathematics, an Fσ set (said F-sigma set) is a countable union of closed sets. The notation originated in France with F for fermé (French: closed) and σ for somme (French: sum, union).In metrizable spaces, every open set is an Fσ set. The complement of an Fσ set is a Gδ set. In a metrizable space, any closed set is a Gδ set.The union of countably many Fσ sets is an Fσ set, and the intersection of finitely many Fσ sets is an Fσ set. Fσ is the same as in the Borel hierarchy.".
- Fσ_set label "Fσ set".
- Fσ_set label "Fσ集合".
- Fσ_set label "Zbiór typu F-sigma".
- Fσ_set sameAs F%CF%83_set.
- Fσ_set sameAs Fσ集合.
- Fσ_set sameAs Zbiór_typu_F-sigma.
- Fσ_set sameAs Q4392123.
- Fσ_set sameAs Q4392123.
- Fσ_set wasDerivedFrom Fσ_set?oldid=592935474.