Theorem Cb_comp : forall L1 L2 : list (poly A0 eqA ltM), (forall p : poly A0 eqA ltM, In p L1 -> Cb A A0 eqA plusA multA eqA_dec n ltM ltM_dec p L2) -> forall q : poly A0 eqA ltM, Cb A A0 eqA plusA multA eqA_dec n ltM ltM_dec q L1 -> Cb A A0 eqA plusA multA eqA_dec n ltM ltM_dec q L2.