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