proposition: Fact hfs_card_pos_pirr n x H1 H2 : @hfs_card_pos n x H1 = @hfs_card_pos n x H2.
proof: Proof. apply hfs_pos_inj; do 2 rewrite <- hfs_card_pos_spec; auto. 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)