Playground.g17
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noncomputable transfinite def V (α : Ordinal) : Set | 0 => ∅ | succ β => 𝒫(V β) | limit λ => ⋃ { V β | β < λ } class CumulativeUniverse (x : Set) := { x | ∃ α, α ∈ Ordinal ∧ x ∈ V(α) }