intros a b P H' H'0 H'1.
cut
(irreducible A A0 A1 eqA invA minusA multA divA eqA_dec n ltM ltM_dec P
(s2p A A0 eqA n ltM
(nf A A0 A1 eqA plusA invA minusA multA divA cs eqA_dec n ltM ltM_dec
os a P))).
2: try exact (nf_irreducible a P); auto.
generalize H';
case
(nf A A0 A1 eqA plusA invA minusA multA divA cs eqA_dec n ltM ltM_dec os a
P); simpl in |- *; auto.
intros x; case x; simpl in |- *.
intros H'2 H'3; elim H'3; auto.
intros a0 l H'2 H'3 H'4; red in |- *; intros H'5; red in H'4.
red in H'4.
generalize H'0 H'1 H'5; case b.
intros x0; case x0; simpl in |- *.
intros o H'6 H'7; elim H'7; auto.
intros a1 l0 o H'6 H'7 H'8.
cut (~ zeroP (A:=A) A0 eqA (n:=n) a1); [ intros nZa1 | idtac ].
apply
H'4
with
(q := spminusf A A0 A1 eqA invA minusA multA divA eqA_dec n ltM ltM_dec
a0 a1 nZa1 l l0); auto.
change
(reduce A A0 A1 eqA invA minusA multA divA eqA_dec n ltM ltM_dec P
(pX a0 l)
(spminusf A A0 A1 eqA invA minusA multA divA eqA_dec n ltM ltM_dec a0 a1
nZa1 l l0)) in |- *.
apply reducetop_sp with (1 := cs) (b := a1) (nZb := nZa1) (q := l0); auto.
change
(inPolySet A A0 eqA n ltM
(s2p A A0 eqA n ltM (mks A A0 eqA n ltM (pX a1 l0) o)) P)
in |- *.
apply in_inPolySet; auto.
simpl in |- *; auto.
red in |- *; intros H'9; inversion H'9.
apply divTerm_def with (nZb := nZa1); auto.
apply canonical_nzeroP with (ltM := ltM) (p := l); auto.
apply divTerm_on_plusM_minusM with (1 := cs); auto.
apply canonical_nzeroP with (ltM := ltM) (p := l); auto.
simpl in |- *; auto.
apply sym_equal; auto.
apply mdiv_div; auto.
apply canonical_nzeroP with (ltM := ltM) (p := l0); auto.
apply nf_irreducible; auto.
Qed.
Definition get_monL : list (poly A0 eqA ltM) -> list (mon n) := map get_mon.
Inductive RO : list (poly A0 eqA ltM) -> list (poly A0 eqA ltM) -> Prop :=
RO0 :
forall (a : poly A0 eqA ltM) (P : list (poly A0 eqA ltM)),
~
zerop A A0 eqA n ltM
(nf A A0 A1 eqA plusA invA minusA multA divA cs eqA_dec n ltM ltM_dec
os a P) ->
RO
(P ++
nf A A0 A1 eqA plusA invA minusA multA divA cs eqA_dec n ltM ltM_dec
os a P :: nil) P.
Definition BadM (l : list (mon n)) := GoodR (mon n) (mdiv n) l -> False.

Lemma l1 :
forall (cs : list (poly A0 eqA ltM)) (ms : list (mon n)),
Bar (mon n) (GoodR (mon n) (mdiv n)) ms ->
forall bs : list (poly A0 eqA ltM),
ms = get_monL bs ->
(forall f : poly A0 eqA ltM, In f bs -> ~ zerop A A0 eqA n ltM f) ->
BadM ms -> Acc RO (cs ++ rev bs).