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The multiplicity of an affine direction `φ` in `c · divisorAffinePolynomial Dv` is `Dv φ`;

Proved
TypeDensity.count_normalizedFactors_divisorAffinePolynomial

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

type-density

The multiplicity of an affine direction φ in c · divisorAffinePolynomial Dv is Dv φ; in particular φ divides it iff Dv φ > 0.

Preamble
import Definitions.Def_TypeDensity_Basic
import Definitions.Def_TypeDensity_Blowup_Directions
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
set_option autoImplicit false

open TypeDensity
open scoped Classical
Formal statement
theorem TypeDensity.count_normalizedFactors_divisorAffinePolynomial (k : Type) [Field k]
    (Dv : ExceptionalDivisor k) (lc : k) (hlc : lc ≠ 0) (φ : AffineDirection k) :
    Multiset.count φ.val (UniqueFactorizationMonoid.normalizedFactors
        (Polynomial.C lc * divisorAffinePolynomial k Dv)) = Dv (some φ) ∧
        (φ.val ∣ divisorAffinePolynomial k Dv ↔ 0 < Dv (some φ)) := by sorry
Source
TypeDensity/Blowup/Directions.lean#L112-L152

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