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Closed G-delta set as a zero set

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Topology Normal topological space
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
A closed subset A of a normal space is a countable intersection of open sets exactly when it is the zero set of some continuous function f:X→[0,1].

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  • Past exam of the mathematics course of the University of Cambridge / 2023 / ii / Paper 3 / 21F / b / Solution

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