∀ {J : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} J] {C : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} C]
  [inst_2 : CategoryTheory.IsConnected J] {F : CategoryTheory.Functor J C} [inst_3 : CategoryTheory.Limits.HasLimit F]
  (c : CategoryTheory.Limits.Cone F),
  Nonempty (CategoryTheory.Limits.IsLimit c) ↔ CategoryTheory.IsIso (CategoryTheory.Limits.limMap c.π)