fact: Definition cat_coprod_beta_inl (f : x $-> z) (g : y $-> z) : cat_coprod_rec f g $o cat_inl $== f := @cat_prod_beta_pr1 A^op x y _ _ _ _ _ _ f g.
imports: Basics EquivGpd Types.Prod Types.Sum WildCat.Core WildCat.ZeroGroupoid WildCat.Equiv WildCat.Yoneda WildCat.Universe WildCat.NatTrans WildCat.Opposite WildCat.Products