The residue roots `θ̄^(q^i)`, `i < deg Φ`, are pairwise distinct roots of `Φ̄` in `k_δ`, so `Φ̄` splits there as the product of the pairwise coprime conjugate factors.
ProvedTypeDensity.conjugate_roots_distincttype-density
The residue roots θ̄^(q^i), i < deg Φ, are pairwise distinct roots of Φ̄ in k_δ, so Φ̄ splits there as the product of the pairwise coprime conjugate factors.
Preamble
import Definitions.Def_TypeDensity_Basic import Definitions.Def_TypeDensity_Formula_LawAlgebra import Definitions.Def_TypeDensity_Algebra_AlgebraType import Definitions.Def_TypeDensity_Measure_AdicCylinders import Definitions.Def_TypeDensity_Measure_HenselProducts import Definitions.Def_TypeDensity_Unramified_Extension import Definitions.Def_TypeDensity_Measure_PrimitiveLocus import Definitions.Def_TypeDensity_Algebra_FactorInvariant import Theorems.Thm_TypeDensity_eval_at_pow_card import Theorems.Thm_TypeDensity_residue_extension_field 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.FieldTheory.Finite.GaloisField import Mathlib.RingTheory.AdicCompletion.Algebra import Mathlib.RingTheory.RegularLocalRing.Defs import Mathlib.RingTheory.Henselian import Mathlib.Topology.Algebra.MvPolynomial import Mathlib.Algebra.Group.Pi.Units import Mathlib.Order.CompletePartialOrder import Mathlib.RingTheory.Polynomial.Resultant.Basic import Mathlib.RingTheory.SimpleRing.Principal import Mathlib.Algebra.GroupWithZero.Submonoid.CancelMulZero import Mathlib.Algebra.Module.StablyFree.Basic import Mathlib.NumberTheory.Padics.RingHoms set_option autoImplicit false open TypeDensity open scoped ENNReal
Formal statement
theorem TypeDensity.conjugate_roots_distinct (O : Type) [CommRing O] [IsLocalRing O]
[IsAdicComplete (IsLocalRing.maximalIdeal O) O] [Finite (IsLocalRing.ResidueField O)]
(Φ : Polynomial O) (hΦ : IsUnramifiedLift O Φ) :
(∀ c : O, residueEmbed O Φ (IsLocalRing.residue O c) = baseReduce O Φ
(algebraMap O (AdjoinRoot Φ) c)) ∧ Function.Injective (residueEmbed O Φ) ∧
(∀ i : ℕ, ((residuePoly O Φ).map (residueEmbed O Φ)).IsRoot (rootBar O Φ ^ residueCard O ^ i))
∧ (∀ i j : ℕ, i < Φ.natDegree → j < Φ.natDegree → rootBar O Φ ^ residueCard O ^ i =
rootBar O Φ ^ residueCard O ^ j → i = j) ∧ (residuePoly O Φ).map (residueEmbed O Φ) = ∏ i :
Fin Φ.natDegree, conjugateFactor O Φ i ∧
(∀ i j : Fin Φ.natDegree, i ≠ j → IsCoprime (conjugateFactor O Φ i) (conjugateFactor O Φ j)) := by sorrySource
TypeDensity/Unramified/PolynomialTypes.lean#L1117-L1196