proposition: Lemma double_minn m n : (minn m n).*2 = minn m.*2 n.*2.
proof: Proof. by rewrite /minn ltn_double; case: ltnP. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(div ssralg ssrint ssrnum binomial) tools combclass sorted ordtype