∀ {C : Type u_1} {D : Type u_2} [inst : CategoryTheory.Category.{v_1, u_1} C]
  [inst_1 : CategoryTheory.Category.{v_2, u_2} D] (F : CategoryTheory.Functor C D) (A : Type u_4) [inst_2 : AddMonoid A]
  [inst_3 : CategoryTheory.HasShift C A] [inst_4 : CategoryTheory.HasShift D A] (a : A) (ha : a = 0) (X : C),
  (CategoryTheory.Functor.CommShift.isoZero' F A a ha).inv.app X =
    CategoryTheory.CategoryStruct.comp ((CategoryTheory.shiftFunctorZero' D a ha).hom.app (F.obj X))
      (F.map ((CategoryTheory.shiftFunctorZero' C a ha).inv.app X))