∀ {X : TopCat} {R : TopCat.Presheaf CommRingCat X}
  (M : PresheafOfModules (CategoryTheory.Functor.comp R (CategoryTheory.forget₂ CommRingCat RingCat))) (x : ↑X)
  {i j : (TopologicalSpace.OpenNhds x)ᵒᵖ} (f : i ⟶ j)
  (r :
    ↑(((TopologicalSpace.OpenNhds.inclusion x).op.comp
            (CategoryTheory.Functor.comp R (CategoryTheory.forget₂ CommRingCat RingCat))).obj
        i))
  (m : ↑(((TopologicalSpace.OpenNhds.inclusion x).op.comp M.presheaf).obj i)),
  (CategoryTheory.ConcreteCategory.hom (M.map ((TopologicalSpace.OpenNhds.inclusion x).op.map f))) (r • m) =
    (CategoryTheory.ConcreteCategory.hom
          ((CategoryTheory.Functor.comp R (CategoryTheory.forget₂ CommRingCat RingCat)).map
            ((TopologicalSpace.OpenNhds.inclusion x).op.map f)))
        r •
      (CategoryTheory.ConcreteCategory.hom (M.map ((TopologicalSpace.OpenNhds.inclusion x).op.map f))) m