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TranslingualEdit

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Wikipedia

EtymologyEdit

From French fermé ‎(closed) for the 'F' and French somme ‎(sum) for the 'σ'. The 'σ' can be interpreted to mean "countable union."

SymbolEdit

Fσ

  1. (analysis, topology) A countable union of closed sets.

HypernymsEdit

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