proposition: Lemma joinKI n m : gcdn m (lcmn m n) = m.
proof: Proof. by rewrite (gcdn_idPl _)// dvdn_lcml. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)