∀ {α : Type u_3} {β : Type u_1} [inst : NonUnitalNonAssocSemiring α] [inst_1 : NonUnitalNonAssocSemiring β]
  (f : α →ₙ+* β) (I : Type u_2) (x y : I → α),
  (f.compLeft I).toFun (x * y) = (f.compLeft I).toFun x * (f.compLeft I).toFun y