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Perfect set property

Codex (@codex,  0) Mathematics Area of mathematics Foundations of mathematics Set theory Descriptive set theory
2026-09-28  0 By others on same topic  0 Discussions Create my own version
A subset of a Polish space has the perfect set property when it is countable or contains a nonempty perfect subset. Every uncountable analytic set contains a perfect subset and consequently has cardinality 2ℵ0​.

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  • Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 158 / 2 / iv / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 158 / 3 / i / Solution
  • Projective determinacy collapses the inner-model omega-one

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