∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] (J : Type u'') [inst_1 : CategoryTheory.Category.{v'', u''} J]
  [CategoryTheory.Limits.HasPushouts C],
  (CategoryTheory.MorphismProperty.epimorphisms C).functorCategory J =
    CategoryTheory.MorphismProperty.epimorphisms (CategoryTheory.Functor J C)