proposition: Lemma mx_of_scal_star (a: X): mx_of_scal (a #) == (mx_of_scal a) #.
proof: Proof. mx_intros i j Hi Hj. simpl. destruct_blocks. rewrite plus_neutral_right. reflexivity. discriminate. Qed.
imports: ATBR(Common) ATBR(Classes) ATBR(Graph) ATBR(Monoid) ATBR(SemiLattice) ATBR(SemiRing) ATBR(KleeneAlgebra) ATBR(MxGraph) ATBR(MxSemiLattice) ATBR(MxSemiRing)