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Cofinite Filter
Alternate name
Definition
If S is an infinite set, then the collection F_S = {A⊆S:S - A is finite} is a filter called the cofinite (or Fréchet) filter on S.
Related terms
If S is an infinite set, then the collection F_S = {A⊆S:S - A is finite} is a filter called the cofinite (or Fréchet) filter on S.