proposition: Fact bt_norm_exist x y (E : x = y) (H1 : bt_norm x = x) (H2 : bt_norm y = y) : exist _ x H1 = exist _ y H2 :> hfs.
proof: Proof. subst; f_equal; apply bt_eq_pirr. Qed.
imports: List Arith Lia Max Wellfounded Setoid Eqdep_dec Bool Undecidability.Shared.Libs.DLW.Utils(utils_tac utils_list finite) Undecidability.Shared.Libs.DLW.Vec(pos vec) Undecidability.Shared.Libs.DLW.Wf(wf_finite wf_chains) Undecidability.FOL.TRAKHTENBROT(notations fol_ops membership btree)