fact: Definition opyon_cancel_0gpd {A : Type} `{Is1Cat A} (a b : A) : (opyon_0gpd a $=> opyon_0gpd b) -> (b $-> a) := un_opyoneda_0gpd a (opyon_0gpd b).
imports: Basics.Overture Basics.Tactics WildCat.Core WildCat.Equiv WildCat.Universe WildCat.Opposite WildCat.FunctorCat WildCat.NatTrans WildCat.Prod WildCat.ZeroGroupoid