proposition: Fact bt2pos_fix n x Hx : pos2bt (@bt2pos n x Hx) ≈ x.
proof: Proof. apply bte_sym, (proj2_sig (@bt2pos_full n x Hx)). Qed.
imports: List Arith Lia Max Wellfounded Setoid Eqdep_dec Undecidability.Shared.Libs.DLW.Utils(utils_tac utils_list utils_decidable finite seteq) Undecidability.Shared.Libs.DLW.Vec(pos) Undecidability.Shared.Libs.DLW.Wf(wf_finite wf_chains) Undecidability.FOL.TRAKHTENBROT(notations fol_ops)