F-sigma set
In mathematics, an F-sigma set (or Fσ set) is a countable union of closed sets. In metrizable spaces, every open set is an Fσ set.The complement of a Fσ set is a Gδ. In a metrizable space, any closed set is a Gδ set.
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F-sigma setIn mathematics, an F-sigma set (or Fσ set) is a countable union of closed sets. In metrizable spaces, every open set is an Fσ set.The complement of a Fσ set is a Gδ. In a metrizable space, any closed set is a Gδ set. |
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