proposition: Corollary equiv_contr_hprop (A : Type) `{Funext} `{IsHProp A} : Contr A <~> A.
proof: Proof. exact (equiv_iff_hprop_uncurried (iff_contr_hprop A)). Defined.
imports: Basics.Overture Basics.Contractible Basics.Equivalences Basics.Tactics Basics.Nat