intros a; case (seqp_dec A A0 eqA eqA_dec n ltM a spO).
case a; unfold red, spO, seqP in |- *; simpl in |- *.
intros x c H' p H'0; inversion H'; auto.
apply reducestar_pO_is_pO with (p := x); auto.
case a; unfold red, spO, seqP in |- *; simpl in |- *.
intros x c H' p H'0.
apply rstar_rtopO; auto.
apply Rstar_n with (y := pO A n); auto.
apply reduce_in_pO with (1 := cs); auto.
change
(inPolySet A A0 eqA n ltM
(s2p A A0 eqA n ltM
(exist (fun l : list (Term A n) => canonical A0 eqA ltM l) x c)) p)
in |- *; apply In_inp_inPolySet; auto.
red in |- *; intros H'2; apply H'; apply (eqp_sym _ _ _ _ _ _ _ _ _ cs n);
auto.
apply Rstar_0; auto.
Qed.

Theorem red_id :
forall (a : poly A0 eqA ltM) (aL : list (poly A0 eqA ltM)),
red (spolyp a a) aL.