proposition: Lemma cartesian_limit_arrow_commutes : is_cone_mor cone' (make_cone _ cartesian_limit_forms_cone) cartesian_limit_arrow.
proof: Proof. intro u. use total2_paths2. - apply (limArrowCommutes L). - exact (maponpaths (λ x, x _ ) (transportf_const _ _) @ limArrowCommutes L' _ _ _ ). Qed.
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