proposition: Lemma set_equiv_wmax_elt (S: r ≡ r') : wmax_elt r ≡₁ wmax_elt r'.
proof: Proof. unfold wmax_elt, same_relation, set_equiv in *; intuition; eauto. Qed.
imports: HahnBase HahnList HahnSets HahnRelationsBasic HahnEquational HahnRewrite Arith Setoid