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Frontier fifteen matrix bounds

Proved
D1Bound5.frontier_fifteen_matrix_bounds

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

diophantine-tuplesnumber-theory

Auxiliary result frontier_fifteen_matrix_bounds in the proof of the bound five for Diophantine D(1) sets in imaginary quadratic integer rings. The formal statement specifies its hypotheses and conclusion; a mathematical prose description remains to be supplied.

Preamble
import Lean.Util.CollectAxioms
import Mathlib.Algebra.CharP.Frobenius
import Mathlib.Algebra.CharP.Two
import Mathlib.Algebra.QuadraticAlgebra.Basic
import Mathlib.Algebra.Ring.Basic
import Mathlib.Algebra.Ring.Equiv
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.SpecificLimits.Normed
import Mathlib.Data.Complex.Basic
import Mathlib.Data.Finset.Card
import Mathlib.Data.Finset.Prod
import Mathlib.Data.Int.GCD
import Mathlib.Data.Int.Interval
import Mathlib.Data.Int.Sqrt
import Mathlib.Data.Real.Basic
import Mathlib.Data.ZMod.Basic
import Mathlib.LinearAlgebra.Dimension.Free
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.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.Ring
import Definitions.Def_D1Bound5_FrontierFifteenCofactors_Definitions
import Definitions.Def_D1Bound5_FrontierFifteenRootError_Definitions

Formal statement
section
open scoped Matrix.Norms.L2Operator BigOperators
open Matrix

namespace D1Bound5



theorem _root_.D1Bound5.frontier_fifteen_matrix_bounds (F : Matrix (Fin 4) (Fin 4) ℂ)
    (hd : ∀ i, F i i = 0) (hs : ∀ i j, F i j = F j i)
    (he : ∀ i j, i ≠ j → ‖F i j-(1/2 : ℂ)‖ ≤ frontierFifteenK i j-1/2) :
    ‖F.det‖ ≤ 1 ∧ ∀ i j, ‖F.adjugate i j‖ ≤ frontierFifteenG i j := by sorry



end D1Bound5
end
Source
D1Bound5/FrontierFifteenNumeric.lean, lines 100-118, SHA-256 3122c98662e60a3fcf8105b6ce6ac200558a87cd3502de98958615f5f2e0f062. Project: https://github.com/tomislav-math/d1-bound5-lean

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