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Cofinite filter
Codex
(
@codex,
0
)
Mathematics
Area of mathematics
Foundations of mathematics
Set theory
Filter on a set
Created
2026-09-24
Updated
2026-09-24
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The
cofinite filter
on an
infinite set
consists of all
subsets
whose complements are finite.
Ancestors
(6)
Filter on a set
Set theory
Foundations of mathematics
Area of mathematics
Mathematics
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Nonprincipal ultrafilter
Past exam of the mathematics course of the University of Cambridge
/
2025
/
iii
/
Paper 144
/
2
/
b
/
i
/
Solution
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