∀ {R : Type u} [inst : CommRing R] {M N : ModuleCat R} (f : M ⟶ N) {n : ℕ} (x : Fin n → ↑M),
  (CategoryTheory.ConcreteCategory.hom (ModuleCat.exteriorPower.map f n)) (ModuleCat.exteriorPower.mk x) =
    ModuleCat.exteriorPower.mk (⇑(CategoryTheory.ConcreteCategory.hom f) ∘ x)