proposition: Lemma cm_Sum_constant (c: CR) (l: list CR): (forall x, List.In x l → x == c) → cm_Sum l == ' length l * c.
proof: Proof. Proof with auto. intros. induction l. simpl. admit. simpl. rewrite IHl... admit. Qed.
imports: Unicode.Utf8 Program CRArith CRabs Qminmax Qauto Qround Qmetric stdlib_omissions.P stdlib_omissions.Z stdlib_omissions.Q stdlib_omissions.N metric2.Classified util.Container Ranges decision