Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A countable union of closed sets.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

Examples

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