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Full ring finite PRow Form exists one le norm

Proved
D1Bound5.full_ring_finitePRowForm_exists_one_le_norm

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

diophantine-tuplesnumber-theory

A genuine full-ring integral row has norm at least one. Both the nonsingularity and the integrality of this constructed P matrix are proved here; they are not supplied as separate approximation certificates.

Preamble
import Mathlib.Algebra.BigOperators.Fin
import Mathlib.Algebra.QuadraticAlgebra.Basic
import Mathlib.Algebra.Ring.Basic
import Mathlib.Algebra.Ring.Equiv
import Mathlib.Analysis.Complex.Norm
import Mathlib.Data.Finset.Card
import Mathlib.Data.Int.GCD
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.FinCases
import Mathlib.Tactic.Linarith
import Mathlib.Tactic.LinearCombination
import Mathlib.Tactic.NormNum
import Mathlib.Tactic.Ring
import Definitions.Def_D1Bound5_FinitePIntegralRows_Definitions

Formal statement
section
open scoped NumberField
open Module

namespace D1Bound5






















theorem _root_.D1Bound5.full_ring_finitePRowForm_exists_one_le_norm
    {K : Type*} [Field K] [NumberField K] [NumberField.IsTotallyComplex K]
    (hK : finrank ℚ K = 2) (phi : K →+* ℂ)
    (a b s c z rA rB rS : 𝓞 K)
    (ha : a ≠ 0) (hb : b ≠ 0) (hs : s ≠ 0)
    (hab : a ≠ b) (has : a ≠ s) (hbs : b ≠ s) (hz : z ≠ 0)
    (hAB : ‖phi (a : K)‖ ≤ ‖phi (b : K)‖)
    (hBS : ‖phi (b : K)‖ ≤ ‖phi (s : K)‖)
    (hC : 200*‖phi (s : K)‖ ≤ ‖phi (c : K)‖) :
    ∃ i : Fin 4, 1 ≤ ‖finitePRowForm (phi (a : K)) (phi (b : K)) (phi (s : K))
      (phi (c : K)) (phi (z : K)) (phi (rA : K)) (phi (rB : K)) (phi (rS : K)) i‖ := by sorry

end D1Bound5
end
Source
D1Bound5/FinitePIntegralRows.lean, lines 140-187, SHA-256 f4ae4543e8d296d5524652a8ec1de382e8c69fd4002555ade9ad3f247eeee37c. Project: https://github.com/tomislav-math/d1-bound5-lean

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