∀ {J : Type u_1} [inst : CategoryTheory.SmallCategory J] (F : CategoryTheory.Functor J RingCat)
  (x y z : RingCat.Colimits.Prequotient F),
  Quot.mk (⇑(RingCat.Colimits.colimitSetoid F)) x * Quot.mk (⇑(RingCat.Colimits.colimitSetoid F)) y *
      Quot.mk (⇑(RingCat.Colimits.colimitSetoid F)) z =
    Quot.mk (⇑(RingCat.Colimits.colimitSetoid F)) x *
      (Quot.mk (⇑(RingCat.Colimits.colimitSetoid F)) y * Quot.mk (⇑(RingCat.Colimits.colimitSetoid F)) z)