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Fσ

From Wiktionary, the free dictionary

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Translingual

English Wikipedia has an article on:

Fσ set

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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