trunk early geometry

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Freiman.trunk_early_geometry

by tp · Sep 9, 2026 · Mathlib 0df444a (Lean v4.33.1)

algebracontinued-fractionsformalization

Select the exact active source plan containing both inherited anchors and the early lower parent anchor.

Preamble

import Definitions.Def_Freiman_trunkGeometry
import Mathlib.Tactic.FinCases
import Mathlib.Tactic.Linarith

open Freiman

Formal statement

theorem Freiman.trunk_early_geometry (t : ℝ) (p : LowerPair) (hs : lowerState t p) (hd : lowerEarlyDomain p) :
    ∃ plan : TrunkPlan, TrunkGeometry p plan ∧ ([3],[2]) ∈ plan.labels ∧ ([2],[2]) ∈ plan.labels ∧ plan.labels.getLast? = some ([3],[2]) := by
  sorry

Source

Report Proposition4.1 s15:trunk, printed report p28; original source pp120–126. Complete sixteen-state trunk certificate,58230 records,90 case plans, with three explicitly unfilled interfaces.

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