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Full ring finite PDet Factor ne zero

Proved
D1Bound5.full_ring_finitePDetFactor_ne_zero

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

diophantine-tuplesnumber-theory

Actual integral arithmetic rules out a zero determinant factor. A nonzero leading factor is an algebraic integer of norm at least one; a zero leading factor is excluded by the exact identity above.

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_FinitePMatrix_Definitions

Formal statement
section
open scoped NumberField
open Module

namespace D1Bound5














theorem _root_.D1Bound5.full_ring_finitePDetFactor_ne_zero
    {K : Type*} [Field K] [NumberField K] [NumberField.IsTotallyComplex K]
    (hK : finrank ℚ K = 2) (phi : K →+* ℂ) (a b s c : 𝓞 K)
    (hs : s ≠ 0) (hab : a ≠ b)
    (hAB : ‖phi (a : K)‖ ≤ ‖phi (b : K)‖)
    (hBS : ‖phi (b : K)‖ ≤ ‖phi (s : K)‖)
    (hC : 200*‖phi (s : K)‖ ≤ ‖phi (c : K)‖) :
    finitePDetFactor (phi (a : K)) (phi (b : K)) (phi (s : K)) (phi (c : K)) ≠ 0 := by sorry









end D1Bound5
end
Source
D1Bound5/FinitePIntegralRows.lean, lines 45-98, SHA-256 f4ae4543e8d296d5524652a8ec1de382e8c69fd4002555ade9ad3f247eeee37c. Project: https://github.com/tomislav-math/d1-bound5-lean

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