∀ {J : Type u_1} [inst : CategoryTheory.SmallCategory J] (F : CategoryTheory.Functor J AddMonCat)
  [inst_1 : CategoryTheory.IsFiltered J] (t : CategoryTheory.Limits.Cocone F) (j : J),
  CategoryTheory.CategoryStruct.comp ((AddMonCat.FilteredColimits.colimitCocone F).ι.app j)
      (AddMonCat.FilteredColimits.colimitDesc F t) =
    CategoryTheory.CategoryStruct.comp ((AddMonCat.FilteredColimits.colimitCocone F).ι.app j)
      (AddMonCat.FilteredColimits.colimitDesc F t)