proposition: Lemma nexp_strext : forall (x y : R) n, x[^]n [#] y[^]n -> x [#] y.
proof: Proof. intros x y n H. exact (un_op_strext_unfolded _ _ _ _ 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)