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Is D1Tuple — fixed cutoff above Q

Proved
D1Bound5.IsD1Tuple.fixed_cutoff_above_Q

by tp · Oct 23, 2026 · Mathlib 0df444a (Lean v4.33.1)

diophantine-tuplesnumber-theory

An actual normalized fixed-triple sextuple above its printed cutoff already lies strictly above the upper Q endpoint. This joins the exact rational cutoff table, retained growth and the actual Q polynomials.

Preamble
import Lean.Elab.Tactic.Omega
import Lean.Util.CollectAxioms
import Mathlib.Algebra.BigOperators.Fin
import Mathlib.Algebra.BigOperators.NatAntidiagonal
import Mathlib.Algebra.CharP.Frobenius
import Mathlib.Algebra.CharP.Two
import Mathlib.Algebra.Group.Int.Units
import Mathlib.Algebra.Order.BigOperators.Ring.Finset
import Mathlib.Algebra.Polynomial.BigOperators
import Mathlib.Algebra.Polynomial.Degree.Operations
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.Analytic.Binomial
import Mathlib.Analysis.CStarAlgebra.Matrix
import Mathlib.Analysis.Complex.Basic
import Mathlib.Analysis.Complex.Norm
import Mathlib.Analysis.Complex.Polynomial.Basic
import Mathlib.Analysis.InnerProductSpace.PiL2
import Mathlib.Analysis.Normed.Group.Basic
import Mathlib.Analysis.Normed.Ring.Basic
import Mathlib.Analysis.SpecificLimits.Normed
import Mathlib.Combinatorics.Enumerative.Catalan.Basic
import Mathlib.Data.Complex.Basic
import Mathlib.Data.Fin.Tuple.Sort
import Mathlib.Data.Fin.VecNotation
import Mathlib.Data.Finset.Card
import Mathlib.Data.Finset.Insert
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.Data.Real.Basic
import Mathlib.Data.Sym.Basic
import Mathlib.Data.Sym.Card
import Mathlib.Data.ZMod.Basic
import Mathlib.LinearAlgebra.Dimension.Free
import Mathlib.LinearAlgebra.Lagrange
import Mathlib.LinearAlgebra.Matrix.Determinant.Basic
import Mathlib.LinearAlgebra.Matrix.NonsingularInverse
import Mathlib.LinearAlgebra.Matrix.Permutation
import Mathlib.LinearAlgebra.Matrix.SchurComplement
import Mathlib.NumberTheory.NumberField.InfinitePlace.TotallyRealComplex
import Mathlib.NumberTheory.NumberField.Norm
import Mathlib.RingTheory.Binomial
import Mathlib.RingTheory.MvPolynomial.Symmetric.Defs
import Mathlib.RingTheory.PowerSeries.Binomial
import Mathlib.Tactic.FieldSimp
import Mathlib.Tactic.FinCases
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_IsD1Tuple
import Definitions.Def_D1Bound5_OneSmallCutoffArithmetic_Definitions_001
import Definitions.Def_D1Bound5_OneSmallCutoffArithmetic_Definitions_002
import Definitions.Def_D1Bound5_OneSmallRows_Definitions
import Definitions.Def_D1Bound5_SmallExtensionSymmetry_Definitions

Formal statement
section
open Finset
open scoped NumberField
open Module

namespace D1Bound5
open QuadInt




theorem _root_.D1Bound5.IsD1Tuple.fixed_cutoff_above_Q
    {K : Type*} [Field K] [NumberField K] [NumberField.IsTotallyComplex K]
    (hK : finrank ℚ K = 2) (phi : K →+* ℂ)
    (a : Fin 6 → 𝓞 K) (ha : IsD1Tuple a)
    (hmon : Monotone (fun i => ‖phi (a i : K)‖))
    (r : OneSmallCutoffRow) (hr : r ∈ oneSmallCutoffRows)
    (e : QuadInt r.triple.tau r.triple.nu ≃+* 𝓞 K)
    (sgn conj : Bool)
    (h0 : smallExtensionSymmetry sgn conj (e.symm (a 0)) = r.triple.anchorA)
    (h1 : smallExtensionSymmetry sgn conj (e.symm (a 1)) = r.triple.anchorB)
    (h2 : smallExtensionSymmetry sgn conj (e.symm (a 2)) = r.triple.anchorS)
    (hlarge : (r.triple.cutoff : ℝ) ≤ ‖phi (a 3 : K)‖^2) :
    ‖phi (a 4 : K)‖^7/(9*‖phi (a 3 : K)‖^2*(1+1/4000 : ℝ)) <
      ‖phi (a 5 : K)‖ := by sorry

end D1Bound5
end
Source
D1Bound5/CoherentFixedCutoffQ.lean, lines 71-125, SHA-256 d5dfa5de63abdc2b053e93b27ddd0a0209bd4e0bebda41d11ab0ae02731d51a6. Project: https://github.com/tomislav-math/d1-bound5-lean

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