trunk endpoint from cf
OpenFreiman.trunk_endpoint_from_cfalgebracontinued-fractionsformalization
The strict second width branch, virtual mixed endpoint and optional7/5 shortening enumerate the actual endpoint; common odd parity changes both the sign and endpoint flag. All rational tails are interpreted by the shared exact CF evaluation.
Preamble
import Definitions.Def_Freiman_trunkGeometry import Mathlib.Tactic.FinCases import Mathlib.Tactic.Linarith open Freiman
Formal statement
theorem Freiman.trunk_endpoint_from_cf (hc : ∀ (w : List ℕ+) (z : CertField), 0 ≤ certFieldVal z → certFieldVal (lowerHistoryCF w z) = prefixEval w (certFieldVal z)) :
TrunkEndpointLaw := by
sorrySource
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.