∀ {J : Type v} [inst : CategoryTheory.Category.{u, v} J] (F : CategoryTheory.Functor J MonCat)
  (s : CategoryTheory.Limits.Cocone F) (x_1 y : MonCat.Colimits.Prequotient F),
  MonCat.Colimits.descFunLift F s (x_1.mul y) = MonCat.Colimits.descFunLift F s x_1 * MonCat.Colimits.descFunLift F s y