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Full ring unit pair four real model

Proved
D1Bound5.full_ring_unit_pair_four_real_model

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

diophantine-tuplesnumber-theory

The exact arithmetic reduction for a genuine unit-pair sextuple: all four other entries are signed norm-two Pell magnitudes for one fixed positive squarefree d congruent to seven modulo eight.

Preamble
import Lean.Elab.Tactic.Omega
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.Norm
import Mathlib.Data.Finset.Card
import Mathlib.Data.Fintype.EquivFin
import Mathlib.Data.Int.GCD
import Mathlib.Data.Int.Sqrt
import Mathlib.LinearAlgebra.Dimension.Free
import Mathlib.NumberTheory.NumberField.InfinitePlace.TotallyRealComplex
import Mathlib.NumberTheory.NumberField.Norm
import Mathlib.Tactic.GCongr
import Mathlib.Tactic.IntervalCases
import Mathlib.Tactic.Linarith
import Mathlib.Tactic.LinearCombination
import Mathlib.Tactic.NormNum
import Mathlib.Tactic.Ring
import Definitions.Def_D1Bound5_IsD1Tuple
import Definitions.Def_D1Bound5_UnitPairArithmeticModel_Definitions
import Definitions.Def_D1Bound5_UnitPairRealReduction_Definitions

Formal statement
section
open scoped NumberField
open Module

namespace D1Bound5
















theorem _root_.D1Bound5.full_ring_unit_pair_four_real_model
    {K : Type*} [Field K] [NumberField K] [NumberField.IsTotallyComplex K]
    (hK : finrank ℚ K = 2) (phi : K →+* ℂ)
    (t : Fin 6 → 𝓞 K) (ht : IsD1Tuple t)
    (hm : t 0 = -1) (hp : t 1 = 1) :
    ∃ M : UnitPairArithmeticModel (𝓞 K), M.d % 8 = 7 ∧
      ∀ i : Fin 4, UnitPairRealDescription M.d (t ⟨i.val+2,by omega⟩) := by sorry



end D1Bound5
end
Source
D1Bound5/UnitPairRealReduction.lean, lines 165-222, SHA-256 e4a826c7ab16daad28ce995ba069b7132c5a664679a6e2cb5595024816c481ec. Project: https://github.com/tomislav-math/d1-bound5-lean

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