proposition: Lemma join_intpartnE sh1 sh2 : (sh1 `|` sh2)%O = (sh1^# `&` sh2^#)%O^#.
proof: Proof. by []. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(div ssralg ssrint ssrnum binomial) tools combclass sorted ordtype