proposition: Lemma coprimep_expr k m n : coprimep m n -> coprimep m (n ^+ k).
proof: Proof. by rewrite !(coprimep_sym m); apply: coprimep_expl. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop ssralg poly)