Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun analysis A
countable union ofclosed 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."
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Examples
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