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Diff — Arithmetical hierarchy

Revision #3138 → #3224 · back to history

modifiedCantor space and Baire space1579bf098242
FieldFrom #3138To #3224
mathlib.declcantorSpace
noteMathlib has Cantor space as ℕ → Bool / ℕ → Fin 2 via the standard product topology, but no first-class `BaireSpace = ℕ → ℕ` definition tied to descriptive set theory.Mathlib has Cantor space as ℕ → Bool / ℕ → Fin 2 via the standard product topology, but no first-class `BaireSpace = ℕ → ℕ` definition tied to descriptive set theory. (Cited declaration no longer exists in Mathlib — cleared by the decl-existence sweep.)
provenanceaiai-moderated
statuspartialnot_formalized