∀ {J : Type v} [inst : CategoryTheory.SmallCategory J] (F : CategoryTheory.Functor J CommRingCat)
  (s : CategoryTheory.Limits.Cocone F) (x_1 y : CommRingCat.Colimits.Prequotient F),
  CommRingCat.Colimits.descFunLift F s (x_1.add y) =
    CommRingCat.Colimits.descFunLift F s x_1 + CommRingCat.Colimits.descFunLift F s y