proposition: Lemma meet_Young_le sh1 sh2 : (meet_Young sh1 sh2 <= sh1)%O.
proof: Proof. by apply/le_YoungP => i; rewrite nth_meet_Young geq_minl. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(div ssralg ssrint ssrnum binomial) tools combclass sorted ordtype