proposition: Lemma star_plus_star_1: forall a b: regex, (a+b)# == (a#+b)#.
proof: Proof. intros. setoid_rewrite star_distr. setoid_rewrite star_idem. reflexivity. Qed.
imports: ATBR(Common) ATBR(Classes) ATBR(Graph) ATBR(SemiLattice) ATBR(Monoid) ATBR(SemiRing) ATBR(KleeneAlgebra) ATBR(Model_RegExp) Coq(Bool)