proposition: Lemma included_FMult' : included R' (Dom Fmult) -> included R' P.
proof: Proof. intro H; simpl in H; eapply included_conj_lft; apply H. Qed.
imports: CoRN.tactics.CornTac CoRN.algebra.CSums CoRN.algebra.CAbMonoids Coq.Sorting.Permutation CoRN.util.SetoidPermutation Coq.Setoids.Setoid Coq.Classes.Morphisms Coq(Lia)