proposition: Lemma coprimep_sym p q : coprimep p q = coprimep q p.
proof: Proof. by rewrite -!gcdp_eqp1; apply: eqp_ltrans; rewrite gcdpC. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop ssralg poly)