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On an `I`-adically complete module, `x ↦ x + r x` is bijective when `r` raises adic order.

Proved
TypeDensity.adic_perturb_bijective

by asving · Oct 16, 2026 · Mathlib 0df444a (Lean v4.33.1)

type-density

On an I-adically complete module, x ↦ x + r x is bijective when r raises adic order.

Preamble
import Definitions.Def_TypeDensity_Basic
import Definitions.Def_TypeDensity_Measure_AdicCylinders
import Theorems.Thm_TypeDensity_adic_congruence_rules
import Theorems.Thm_TypeDensity_adic_perturb_congruence_iff
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 scoped ENNReal
Formal statement
theorem TypeDensity.adic_perturb_bijective (R M : Type) [CommRing R] [AddCommGroup M] [Module R M] (I : Ideal R)
    (r : M → M) (hr : RaisesAdicOrder I r) [IsAdicComplete I M] :
    Function.Bijective (adicPerturb r) := by sorry
Source
TypeDensity/Measure/AdicTransport.lean#L179-L190

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