proposition: Lemma Qplus_le_lt_0_compat x y: 0 <= x -> 0 < y -> 0 < x + y.
proof: Proof. rewrite Qplus_comm. intros. apply (Qplus_lt_le_0_compat y x); assumption. Qed.
imports: Coq.QArith.QArith Coq.ZArith.ZArith Coq.NArith.NArith Coq.QArith.Qpower Coq.QArith.Qround Coq.QArith.Qround Coq.QArith.Qabs CoRN.stdlib_omissions.List