proposition: Lemma lin_ren delta S t: ren delta (lin S t) = lin (renL delta S) (ren delta t).
proof: Proof. unfold lin; asimpl; now rewrite !map_map. Qed.
imports: RelationClasses Morphisms List Lia Init.Nat Setoid Undecidability.HOU(calculus.calculus second_order.diophantine_equations systemunification nth_order_unification)