intros L1 L2 H' q; case q; simpl in |- *.
intros x H'0 H'1.
apply CombLinear_compo with (1 := cs) (L1 := L1); auto.
intros q0 H'2.
case inPolySet_inv1 with (1 := H'2); auto.
intros q1 H; elim H; intros H0 H1; clear H.
lapply (H' q1); [ intros H'6 | idtac ]; auto.
generalize H'6 H1; case q1; simpl in |- *; auto.
intros x0 H'5 H'7 H'8; rewrite H'8; auto.
Defined.

Theorem Cb_nf :
forall (p : poly A0 eqA ltM) (L : list (poly A0 eqA ltM)),
Cb A A0 eqA plusA multA eqA_dec n ltM ltM_dec p
(nf A A0 A1 eqA plusA invA minusA multA divA cs eqA_dec n ltM ltM_dec os p
L :: L).