Definition CoLimit_law1 :=
    forall (c : C) (tau : CoCone F c), CoLimit_eq tau (cl_diese tau).

Lemma Cldiese_map : forall (c : C) (tau1 tau2 : CoCone F c), tau1 =_NT tau2 -> Colim_diese l tau1 =_S Colim_diese l tau2.