fact: Definition equiv_Ordinal_to_sig : Ordinal <~> { R : { A : Type & Relation A } & IsOrdinal _ R.2 }.
imports: HoTT(TruncType ExcludedMiddle Modalities.ReflectiveSubuniverse abstract_algebra) HoTT(PropResizing.PropResizing) HoTT(Colimits.Quotient) HoTT(HSet)