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Negative integer square floor obstruction trace zero

Proved
D1Bound5.negative_integer_square_floor_obstruction_trace_zero

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

diophantine-tuplesnumber-theory

Negative rational radicands in the trace-zero model reduce to minus the defining parameter times an ordinary integer square.

Preamble
import Mathlib.Algebra.Order.Ring.Abs
import Mathlib.Algebra.QuadraticAlgebra.Basic
import Mathlib.Data.Int.Sqrt
import Mathlib.Tactic.Linarith
import Definitions.Def_D1Bound5_Coordinates_Definitions

Formal statement
section
namespace D1Bound5








theorem _root_.D1Bound5.negative_integer_square_floor_obstruction_trace_zero {nu m k : ℤ}
    (hnu : 0 < nu) (hk : 0 ≤ k)
    (hlo : nu * k ^ 2 < -m) (hhi : -m < nu * (k + 1) ^ 2) :
    ¬ ∃ r : QuadInt 0 nu, r * r = (m : QuadInt 0 nu) := by sorry



namespace QuadInt









end QuadInt
end D1Bound5
end
Source
D1Bound5/QuadSquareFloorObstruction.lean, lines 40-51, SHA-256 189bc6919f96623fb014a3f2f03e165069f8dce0da25caec94ef0406cc2c9b3e. Project: https://github.com/tomislav-math/d1-bound5-lean

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