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Finite A5 fixed height of norm sq

Proved
D1Bound5.finiteA5_fixed_height_of_norm_sq

by tp · Oct 24, 2026 · Mathlib 0df444a (Lean v4.33.1)

diophantine-tuplesnumber-theory

Exact coefficient norm identities suffice for height transfer; no identification of the ambient field with a coordinate ring is needed.

Preamble
import Lean.Elab.Tactic.Omega
import Mathlib.Algebra.BigOperators.Fin
import Mathlib.Algebra.Group.Int.Units
import Mathlib.Algebra.Polynomial.Monic
import Mathlib.Algebra.QuadraticAlgebra.Basic
import Mathlib.Algebra.Ring.Basic
import Mathlib.Algebra.Ring.Equiv
import Mathlib.Algebra.Squarefree.Basic
import Mathlib.Analysis.Complex.Basic
import Mathlib.Analysis.Complex.Norm
import Mathlib.Analysis.Complex.Polynomial.Basic
import Mathlib.Analysis.Normed.Ring.Basic
import Mathlib.Data.Fin.Tuple.Sort
import Mathlib.Data.Finset.Card
import Mathlib.Data.Finset.Prod
import Mathlib.Data.Fintype.EquivFin
import Mathlib.Data.Int.GCD
import Mathlib.Data.Int.Interval
import Mathlib.Data.Int.Sqrt
import Mathlib.Data.List.Range
import Mathlib.LinearAlgebra.Dimension.Free
import Mathlib.LinearAlgebra.Matrix.Determinant.Basic
import Mathlib.LinearAlgebra.Matrix.NonsingularInverse
import Mathlib.NumberTheory.NumberField.InfinitePlace.TotallyRealComplex
import Mathlib.NumberTheory.NumberField.Norm
import Mathlib.Tactic
import Mathlib.Tactic.Convert
import Mathlib.Tactic.FieldSimp
import Mathlib.Tactic.GCongr
import Mathlib.Tactic.IntervalCases
import Mathlib.Tactic.Linarith
import Mathlib.Tactic.LinearCombination
import Mathlib.Tactic.NormNum
import Mathlib.Tactic.Positivity
import Mathlib.Tactic.Ring
import Definitions.Def_D1Bound5_Coordinates_Definitions
import Definitions.Def_D1Bound5_FiniteA5Coefficients_Definitions
import Definitions.Def_D1Bound5_FiniteA5FixedHeight_Definitions
import Definitions.Def_D1Bound5_FiniteA5Matrix_Definitions

Formal statement
section
open scoped NumberField

namespace D1Bound5
open QuadInt


theorem _root_.D1Bound5.finiteA5_fixed_height_of_norm_sq {tau nu : ℤ}
    (a b : QuadInt tau nu) (M : ℚ)
    (w : Fin 3 → Fin 2 → Fin 6 → ℚ) (hbound : FiniteA5FixedBound a b M w)
    (X Y Z : ℂ) (hBsq : ‖Y‖^2 = (b.norm : ℝ))
    (hnorm : ∀ i j ell, ‖finiteA5RootCoeff X Y i j ell‖^2 =
      ((finiteA5RootCoeff a b i j ell).norm : ℝ))
    (hy0 : Y ≠ 0) (hC : 1000 ≤ ‖Z‖) (hCB : 200*‖Y‖ ≤ ‖Z‖) (i : Fin 3) :
    (101/100 : ℝ)*(‖finiteA5Left X Y Z i‖+‖finiteA5Right X Y Z i‖) <
      (M : ℝ)*‖Y‖^12*‖Z‖^5 := by sorry



end D1Bound5
end
Source
D1Bound5/FiniteA5RationalHeight.lean, lines 9-64, SHA-256 7091f48fc6c9a1c195e5fc6017b3e00b4845cfecad1cdf34ee765a3ebcc29d15. Project: https://github.com/tomislav-math/d1-bound5-lean

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