proposition: Fact nat_lb_fix_2 n : ⟬1+2*n⟭ = ⟙::⟬ n⟭ .
proof: Proof. apply g_nlb_fun with (1+2*n); auto. constructor; auto; try lia. + apply rem_2_fix_2. + rewrite div_2_fix_2; auto. Qed.
imports: Arith Nat Lia List Bool Setoid Undecidability.Shared.Libs.DLW.Utils(utils_tac utils_list utils_nat bool_list gcd sums power_decomp)