Freiman.lowerEarlyTerminal_width_tie_coefficients
ProvedFreiman.lowerEarlyTerminal_width_tie_coefficientshall-raynumber-theory
Equal full widths force equality of the rational and √21 coefficients of their denominator quadratics.
Preamble
import Definitions.Def_Freiman_lowerEarlyTerminalGeometry open Freiman
Formal statement
theorem Freiman.lowerEarlyTerminal_width_tie_coefficients (hw : ∀ w : List ℕ+, lowerWidth w = (lowerBeta-lowerAlpha)/
((((lowerCD w).1:ℝ)*lowerAlpha+(lowerCD w).2)*(((lowerCD w).1:ℝ)*lowerBeta+(lowerCD w).2))) (u v : List ℕ+)
(h : lowerWidth u = lowerWidth v) : (((lowerCD u).1:ℤ)^2+((lowerCD u).2:ℤ)^2 =
((lowerCD v).1:ℤ)^2+((lowerCD v).2:ℤ)^2) ∧
(4*((lowerCD u).1:ℤ)*(lowerCD u).2-3*((lowerCD u).1:ℤ)^2 =
4*((lowerCD v).1:ℤ)*(lowerCD v).2-3*((lowerCD v).1:ℤ)^2) := by
sorrySource
Freiman's Hall ray: Proof report and corrected English text (8 September 2026), pp.120–132, §§ s15:early-residual and s15:terminal-extension; pp.133–139, Proposition l139chain and Appendix app:l139cert. Full-width formula with α=(√21−3)/6, β=3α; irrationality of √21 separates the two integer coefficients.