proposition: Lemma seq_r_eqv_min r : r^? ⨾ ⦗min_elt r⦘ ≡ ⦗min_elt r⦘.
proof: Proof. rewrite crE; relsf; rewrite seq_eqv_min; relsf. Qed.
imports: HahnBase HahnList HahnSets HahnRelationsBasic HahnEquational HahnRewrite HahnMaxElt Arith Setoid