Is D1Tuple — small triple classification
ProvedD1Bound5.IsD1Tuple.small_triple_classificationdiophantine-tuplesnumber-theory
Full-ring small-triple classification: precisely four coordinate models are possible, and the unordered triple lies in the explicit 24-entry table. The models are the full rings for d = 1, 2, 3, 7 respectively.
Preamble
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.Fin.Tuple.Sort import Mathlib.Data.Finset.Card 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.LinearAlgebra.Dimension.Free import Mathlib.NumberTheory.NumberField.InfinitePlace.TotallyRealComplex import Mathlib.NumberTheory.NumberField.Norm import Mathlib.Tactic.IntervalCases import Mathlib.Tactic.Linarith import Mathlib.Tactic.LinearCombination import Definitions.Def_D1Bound5_Coordinates_Definitions import Definitions.Def_D1Bound5_IsD1Tuple import Definitions.Def_D1Bound5_SmallTripleCheck_Definitions import Definitions.Def_D1Bound5_SmallTripleData_Definitions
Formal statement
section
open scoped NumberField
open Module
namespace D1Bound5
open QuadInt
theorem _root_.D1Bound5.IsD1Tuple.small_triple_classification
{K : Type*} [Field K] [NumberField K] [NumberField.IsTotallyComplex K]
(hK : finrank ℚ K = 2) (phi : K →+* ℂ)
(t : Fin 3 → 𝓞 K) (ht : IsD1Tuple t)
(hsmall : ∀ i, ‖phi (t i : K)‖ < 3) :
∃ (tau nu : ℤ) (e : QuadInt tau nu ≃+* 𝓞 K),
((tau = 0 ∧ nu = 1) ∨ (tau = 0 ∧ nu = 2) ∨
(tau = 1 ∧ nu = 1) ∨ (tau = 1 ∧ nu = 2)) ∧
tripleCoordinates (e.symm (t 0)) (e.symm (t 1)) (e.symm (t 2)) ∈
smallTripleTable tau nu := by sorry
end D1Bound5
end
Source
D1Bound5/SmallTripleClassification.lean, lines 74-118, SHA-256 29c06a840b00bae4fa8a3417f349d7002808f0195fa16482f0c5528783af6485. Project: https://github.com/tomislav-math/d1-bound5-lean