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Eisenstein no three trace zero extensions

Proved
D1Bound5.eisenstein_no_three_trace_zero_extensions

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

diophantine-tuplesnumber-theory

Three nonzero imaginary Eisenstein integers cannot be pairwise compatible. This arithmetic endpoint is independent of any coordinate classification or Pell/descent completeness premise.

Preamble
import Mathlib.Algebra.QuadraticAlgebra.Basic
import Mathlib.Algebra.Ring.Basic
import Mathlib.Algebra.Ring.Equiv
import Mathlib.Data.Finset.Card
import Mathlib.Data.Int.Sqrt
import Mathlib.Tactic.Linarith
import Definitions.Def_D1Bound5_Coordinates_Definitions

Formal statement
section
namespace D1Bound5








theorem _root_.D1Bound5.eisenstein_no_three_trace_zero_extensions
    (x y z : QuadInt 1 1) (hx0 : x ≠ 0) (hy0 : y ≠ 0) (hz0 : z ≠ 0)
    (hx : 2 * x.re + x.im = 0) (hy : 2 * y.re + y.im = 0)
    (hz : 2 * z.re + z.im = 0)
    (hxy : ∃ r : QuadInt 1 1, r * r = x * y + 1)
    (hxz : ∃ r : QuadInt 1 1, r * r = x * z + 1)
    (hyz : ∃ r : QuadInt 1 1, r * r = y * z + 1) : False := by sorry



end D1Bound5
end
Source
D1Bound5/EisensteinImaginaryExtensions.lean, lines 52-67, SHA-256 1a43096b0a3b24a44183306c5af3c14190bbed00150a819de4741684b454e355. Project: https://github.com/tomislav-math/d1-bound5-lean

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