fact: Definition cat_coprod_eta (f : cat_coprod x y $-> z) : cat_coprod_rec (f $o cat_inl) (f $o cat_inr) $== f := @cat_prod_eta A^op x y _ _ _ _ _ _ f.
imports: Basics EquivGpd Types.Prod Types.Sum WildCat.Core WildCat.ZeroGroupoid WildCat.Equiv WildCat.Yoneda WildCat.Universe WildCat.NatTrans WildCat.Opposite WildCat.Products