F_σ

Translingual

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

F_σ

单词	Fσ
释义	F_σ Translingual Etymology From French fermé (“closed”) for the 'F' and French somme (“sum”) for the 'σ'. The 'σ' can be interpreted to mean "countable union." Symbol F_σ (mathematical analysis, topology) A countable union of closed sets. Hypernyms Borel set
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