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Fσ. In DICTIOUS you will not only get to know all the dictionary meanings for the word
Fσ, but we will also tell you about its etymology, its characteristics and you will know how to say
Fσ in singular and plural. Everything you need to know about the word
Fσ you have here. The definition of the word
Fσ will help you to be more precise and correct when speaking or writing your texts. Knowing the definition of
Fσ, as well as those of other words, enriches your vocabulary and provides you with more and better linguistic resources.
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
Fσ
- (mathematical analysis, topology) A countable union of closed sets.
Hypernyms