other22 context rectangle

Proved

Freiman.other22_context_rectangle

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

algebracontinued-fractionsformalization

The six elementary continued-fraction suffix bounds put the actual r,s parameters in the exact printed closed rectangles; empty-prefix boundary cases and weak endpoints are retained.

Preamble

import Definitions.Def_Freiman_other22Verification
import Mathlib.Tactic.FinCases
import Mathlib.Tactic.SplitIfs

open Freiman

Formal statement

theorem Freiman.other22_context_rectangle (Z B R S : LowerPair) (h : LowerOther22Geometry Z B R S) (k : Fin 6) (hc : lowerHistoryContextFits Z (other22Context k)) :
    certRectangleMem (other22Paths k).rectangle (lowerRatio Z.1) (lowerRatio Z.2) := by
  sorry

Source

Report §7.3, Lemma 7.4 (lem:old23-other22-target), printed p.43; other22_target.tex and Appendix other22_certificates.tex; original 144-obligation exact certificate.

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