fact: Definition yon_equiv_0gpd {A : Type} `{HasEquivs A} {a b : A} (f : yon1_0gpd a $<~> yon1_0gpd b) : a $<~> b := opyon_equiv_0gpd (A:=A^op) f.
imports: Basics.Overture Basics.Tactics WildCat.Core WildCat.Equiv WildCat.Universe WildCat.Opposite WildCat.FunctorCat WildCat.NatTrans WildCat.Prod WildCat.ZeroGroupoid