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Complex square root lift

Proved
D1Bound5.complex_square_root_lift

by tp · Oct 24, 2026 · Mathlib 0df444a (Lean v4.33.1)

diophantine-tuplesnumber-theory

A complex number whose square agrees with that of a ring element already lies in the image of that ring. Zero roots are permitted.

Preamble
import Mathlib.Algebra.BigOperators.NatAntidiagonal
import Mathlib.Algebra.QuadraticAlgebra.Basic
import Mathlib.Algebra.Ring.Basic
import Mathlib.Algebra.Ring.Equiv
import Mathlib.Analysis.Analytic.Binomial
import Mathlib.Analysis.Complex.Basic
import Mathlib.Analysis.Complex.Norm
import Mathlib.Analysis.Normed.Ring.Basic
import Mathlib.Analysis.SpecificLimits.Normed
import Mathlib.Data.Finset.Card
import Mathlib.Data.Finset.Insert
import Mathlib.Data.Int.GCD
import Mathlib.Data.Sym.Basic
import Mathlib.Data.Sym.Card
import Mathlib.LinearAlgebra.Dimension.Free
import Mathlib.LinearAlgebra.Lagrange
import Mathlib.NumberTheory.NumberField.InfinitePlace.TotallyRealComplex
import Mathlib.NumberTheory.NumberField.Norm
import Mathlib.RingTheory.Binomial
import Mathlib.RingTheory.MvPolynomial.Symmetric.Defs
import Mathlib.Tactic.Linarith
import Mathlib.Tactic.LinearCombination

Formal statement
section
open Finset
open scoped NumberField
open Module

namespace D1Bound5






theorem _root_.D1Bound5.complex_square_root_lift
    {R : Type*} [CommRing R] (f : R →+* ℂ) (z : ℂ) (r : R)
    (h : z ^ 2 = (f r) ^ 2) : ∃ t : R, f t = z := by sorry









end D1Bound5
end
Source
D1Bound5/CoherentIntegralForms.lean, lines 19-26, SHA-256 81e6a044e834ea1f7a20cfce931dfefd9cdd8cbc6a1dc7467c69328d64c38e4c. Project: https://github.com/tomislav-math/d1-bound5-lean

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