fact: Definition equiv_postcompose_core_cat_equiv {A : Type} `{HasEquivs A} `{!HasMorExt (core A)} {x y z : A} (f : y $<~> z) : (x $<~> y) <~> (x $<~> z).
imports: Basics.Overture Basics.Tactics WildCat.Core WildCat.Equiv WildCat.Universe WildCat.Opposite WildCat.FunctorCat WildCat.NatTrans WildCat.Prod WildCat.ZeroGroupoid