proposition: Lemma pow2_zero: forall sz, (pow2 sz > 0)%nat.
proof: Proof. induction sz; simpl; auto; lia. Qed.
imports: Coq.Classes.Morphisms Coq.Classes.Morphisms_Prop Coq.Bool.Bool Coq.Arith.Arith Coq.micromega.Lia Coq.NArith.NArith Coq.ZArith.ZArith bbv.N_Z_nat_conversions bbv.Nomega