proposition: Lemma size_meet_Young sh1 sh2 : size (meet_Young_fun sh1 sh2) = minn (size sh1) (size sh2).
proof: Proof. by rewrite size_map size_zip. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(div ssralg ssrint ssrnum binomial) tools combclass sorted ordtype