proposition: Lemma ltEintpartnlexi sh1 sh2 : (sh1 < sh2)%O = (sh1 < sh2 :> seqlexi nat)%O.
proof: Proof. by []. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(div ssralg ssrint ssrnum binomial) tools combclass sorted ordtype