Translingual

edit
 
English Wikipedia has an article on:
Wikipedia

Etymology

edit

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

Symbol

edit

Fσ

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

Hypernyms

edit