proposition: Theorem reducestar_cb2 : forall (a b : poly A0 eqA ltM) (Q : list (poly A0 eqA ltM)), reducestar A A0 A1 eqA invA minusA multA divA eqA_dec n ltM ltM_dec Q (s2p A A0 eqA n ltM a) (s2p A A0 eqA n ltM b) -> CombLinear (b :: Q) (s2p A A0 eqA n ltM a).
proof: Proof. Proof using os cs. intros a b Q H'; inversion H'; auto. apply reduceplus_cb2; auto. Qed.