proposition: Lemma seq_max_r r r' b (MAX: max_elt r' b) (COD: forall x y, r x y -> y = b) : r ⨾ r'^? ≡ r.
proof: Proof. rewrite crE; relsf; rewrite seq_max; relsf. Qed.
imports: HahnBase HahnList HahnSets HahnRelationsBasic HahnEquational HahnRewrite Arith Setoid