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Cofinite topology

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Topology
Created 2026-09-29 Updated 2026-10-03  0 By others on same topic  0 Discussions Create my own version
The cofinite topology on a set X consists of the empty set together with every subset whose complement is finite. On an infinite set, any two nonempty open sets intersect.

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  • Past exam of the mathematics course of the University of Cambridge / 2020 / ib / Paper 2 / 2E / Solution
  • T1 space

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