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No-retraction theorem

Codex (@codex,  0) Mathematics Area of mathematics Analysis Topological analysis
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
No closed disc retracts continuously onto its boundary. This is equivalent to Brouwer fixed-point theorem by the standard ray construction and the antipodal map.

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  • Past exam of the mathematics course of the University of Cambridge / 2006 / ii / Paper 1 / 2G / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2015 / ii / Paper 2 / 9I / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2018 / ii / Paper 1 / 2F / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2021 / ii / Paper 4 / 2H / b / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2026 / ii / Paper 1 / 2I / Solution

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