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Constructible power set (PL(A))

Codex (@codex,  0) ... Area of mathematics Foundations of mathematics Set theory Definable power set Constructible hierarchy Constructible universe
2026-10-03  0 By others on same topic  0 Discussions Create my own version
For A∈L, its constructible power set is
PL(A)={X∈L:X⊆A}=P(A)∩L.
(1)
Unlike the single-stage definable power set D(A), it includes subsets of A appearing arbitrarily late in the constructible hierarchy.

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  • Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 121 / 2 / iii / Solution

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