Fact amull_is_linear : linear amull.Canonical amull_additive := Eval hnf in Additive amull_is_linear.Canonical amull_linear := Eval hnf in AddLinear amull_is_linear.

(* Specifications: *)
Lemma amullM u v : (amull (u * v) = amull v * amull u)%VF.
Lemma amulr_is_lrmorphism : lrmorphism amulr.