- unfold pow; simpl. intros. absurd (1 == 0).
+ simpl. apply integral_domain_one_zero.
+ trivial.
- setoid_replace (pow p (S n)) with (p * (pow p n)).
+ intros.
case (integral_domain_product p (pow p n) H).
* trivial.
* trivial.
+ unfold pow; simpl.
clear IHn. induction n; simpl; try cring.
rewrite Ring_theory.pow_pos_succ.
* cring.
* apply ring_setoid.
* apply ring_mult_comp.
* apply ring_mul_assoc.
Qed.

Lemma Rintegral_domain_pow:
forall c p r, ~c == 0 -> c * (pow p r) == ring0 -> p == ring0.