∀ {R : Type u_1} {ι : Type u_2} {M₂ : Type u_3} [inst : CommSemiring R] [inst_1 : AddCommMonoid M₂]
  [inst_2 : Module R M₂] [inst_3 : Fintype ι] (c : R) (z : M₂),
  MultilinearMap.mkPiRing R ι (c • z) = (RingHom.id R) c • MultilinearMap.mkPiRing R ι z