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Cofiniteness

In mathematics, a cofinite subset of a set X {\displaystyle X} is a subset A {\displaystyle A} whose complement in X {\displaystyle X} is a finite set. In other words, A {\displaystyle A} contains all but finitely many elements of X . {\displaystyle X.} If the complement is not finite, but is countable, then one says the set is cocountable.

Products, Cofinite topology & Boolean algebras

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Boolean algebras

Cofinite topology

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Cofiniteness

Nodes50
Edges49
Triples0
Avg. degree1.96
Density0.04
Components1

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displaystyle topology cofinite set finite many sets complement product every open direct subsets closed contains finitely boolean sum whole since

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