Exists quadratic ring equiv

import Mathlib.Algebra.QuadraticAlgebra.Basic
import Mathlib.Data.Int.GCD
import Mathlib.LinearAlgebra.Dimension.Free
import Mathlib.NumberTheory.NumberField.Norm
import Mathlib.Tactic.Linarith
import Mathlib.Tactic.LinearCombination
import Definitions.Def_D1Bound5_Coordinates_Definitions

section
open scoped NumberField
open Module

namespace D1Bound5

variable {K : Type*} [Field K] [NumberField K]







theorem _root_.D1Bound5.exists_quadratic_ring_equiv (hK : finrank ℚ K = 2) :
    ∃ tau nu : ℤ, Nonempty (QuadInt tau nu ≃+* 𝓞 K) := by sorry



end D1Bound5
end