fact: Definition cat_coprod_in_eta {f f' : cat_coprod x y $-> z} : f $o cat_inl $== f' $o cat_inl -> f $o cat_inr $== f' $o cat_inr -> f $== f' := @cat_prod_pr_eta A^op x y _ _ _ _ _ _ f f'.
imports: Basics EquivGpd Types.Prod Types.Sum WildCat.Core WildCat.ZeroGroupoid WildCat.Equiv WildCat.Yoneda WildCat.Universe WildCat.NatTrans WildCat.Opposite WildCat.Products