proposition: Lemma invariant_empty : invariant DS.empty.
proof: Proof. constructor. ti_auto. intros x y Hxy. apply DS.sameclass_empty in Hxy; subst. reflexivity. Qed.
imports: ATBR(Common) ATBR(Classes) ATBR(Graph) ATBR(Monoid) ATBR(SemiLattice) ATBR(SemiRing) ATBR(KleeneAlgebra) ATBR(MxGraph) ATBR(MxSemiLattice) ATBR(MxSemiRing) ATBR(MxKleeneAlgebra) ATBR(DKA_Definitions) ATBR(DKA_StateSetSets) ATBR(Utils_WF) Coq(Relations) Coq(List)