proposition: Lemma RiemannInt_linear_1 : forall (f g:R -> R) (a b l:R) (pr1:Riemann_integrable f a b) (pr2:Riemann_integrable g a b), RiemannInt pr1 + l * RiemannInt pr2 = RiemannInt (Riemann_integrable_linear f g a b l pr1 pr2).
proof: Proof. intros. symmetry. apply RiemannInt_linear. Qed.
imports: PeanoNat Reals Lra RiemannInt Rfunction_classes_def Rextensionality