For the `I`-adic topology on `O`, the Borel σ-algebra of `O^n` is generated by the adic cylinders.
ProvedTypeDensity.finite_coordinate_borel_cylinderstype-density
For the I-adic topology on O, the Borel σ-algebra of O^n is generated by the adic cylinders.
Preamble
import Definitions.Def_TypeDensity_Basic import Definitions.Def_TypeDensity_Measure_AdicCylinders import Theorems.Thm_TypeDensity_finite_coordinate_cylinder_basis import Mathlib.FieldTheory.RatFunc.Basic import Mathlib.MeasureTheory.Measure.Haar.Unique import Mathlib.NumberTheory.ArithmeticFunction.Moebius import Mathlib.NumberTheory.Padics.PadicIntegers import Mathlib.RingTheory.IntegralClosure.IntegralRestrict import Mathlib.RingTheory.MvPowerSeries.Basic import Mathlib.RingTheory.RamificationInertia.Basic import Mathlib.Topology.Algebra.Nonarchimedean.AdicTopology import Mathlib.Topology.Algebra.MvPolynomial set_option autoImplicit false open TypeDensity open MeasureTheory open scoped BigOperators ENNReal
Formal statement
theorem TypeDensity.finite_coordinate_borel_cylinders (O : Type) [CommRing O] [TopologicalSpace O]
[IsTopologicalRing O] (I : Ideal O) (htop : IsAdic I) (n : ℕ) [SecondCountableTopology O]
[MeasurableSpace O] [BorelSpace O] :
(inferInstance : MeasurableSpace (Fin n → O)) = adicCylinderSpace I (Fin n → O) := by sorrySource
TypeDensity/Measure/AdicCylinders.lean#L974-L981