fact: Definition adjunction_unit : NatTrans (F o G) idmap.
imports: Basics.Utf8 Basics.Overture Basics.Tactics Basics.Equivalences WildCat.Core WildCat.NatTrans WildCat.Equiv WildCat.Prod WildCat.Opposite WildCat.Yoneda WildCat.FunctorCat WildCat.Universe Types.Prod