proposition: Lemma bool_dec' : forall a b: bool, a=b \/ a<>b.
proof: Proof. intros. destruct (bool_dec a b); auto. 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(Utils_WF) Coq(Relations) Coq(Eqdep_dec)