proposition: Lemma dot_scal_left_zero n m x: x '* (0: MX n m) == 0.
proof: Proof. repeat intro; simpl. trivial with algebra. Qed.
imports: ATBR(Common) ATBR(Classes) ATBR(Graph) ATBR(Monoid) ATBR(SemiLattice) ATBR(SemiRing) ATBR(MxGraph) ATBR(MxSemiLattice) ATBR(BoolView)