proposition: Lemma coprimep_modr q p : coprimep q (p %% q) = coprimep q p.
proof: Proof. by rewrite ![coprimep q _]coprimep_sym coprimep_modl. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop ssralg poly)