proposition: Lemma dvdpN0 p q : p %| q -> q != 0 -> p != 0.
proof: Proof. by move=> pq hq; apply: contraTneq pq => ->; rewrite dvd0p. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop ssralg poly)