intros p; elim p.
simpl in |- *; auto.
intros; apply (eqp_sym _ _ _ _ _ _ _ _ _ cs n); auto.
intros a l H' a0 b H'0 H'1; simpl in |- *.
apply
(eqp_trans _ _ _ _ _ _ _ _ _ cs n)
with
(y := minuspf (mults (A:=A) multA (n:=n) a0 l)
(mults (A:=A) multA (n:=n) b l)); auto.
apply minuspf_inv3a; auto.
apply
zeroP_comp_eqTerm
with
(1 := cs)
(a := multTerm (A:=A) multA (n:=n) (minusTerm (A:=A) minusA (n:=n) a0 b)
a); auto.
apply (eqTerm_sym _ _ _ _ _ _ _ _ _ cs n); auto.
apply multTerm_minusTerm_dist_l with (1 := cs); auto.
Qed.

Theorem mults_minusTerm :
forall (p : list (Term A n)) (a b : Term A n),
eqT a b ->
~ zeroP (A:=A) A0 eqA (n:=n) (minusTerm (A:=A) minusA (n:=n) a b) ->
canonical A0 eqA ltM p ->
eqP A eqA n
(mults (A:=A) multA (n:=n) (minusTerm (A:=A) minusA (n:=n) a b) p)
(minuspf (mults (A:=A) multA (n:=n) a p) (mults (A:=A) multA (n:=n) b p)).