fact: Definition issig_NatEquiv {A B : Type} `{IsGraph A} `{HasEquivs B} (F G : A -> B) `{!Is0Functor F, !Is0Functor G} : _ <~> NatEquiv F G := ltac:(issig).
imports: Basics.Overture Basics.Tactics WildCat.Core WildCat.Equiv WildCat.Square