∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {A : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} A]
  (J : CategoryTheory.GrothendieckTopology C) [inst_2 : CategoryTheory.CartesianMonoidalCategory A],
  CategoryTheory.Functor.OplaxMonoidal.η (CategoryTheory.sheafToPresheaf J A) =
    CategoryTheory.CategoryStruct.id
      ((CategoryTheory.sheafToPresheaf J A).obj
        (CategoryTheory.MonoidalCategoryStruct.tensorUnit (CategoryTheory.Sheaf J A)))