proposition: Lemma cast_conj_inpart m n eq_m_n (s : 'P_m) : (@cast_intpartn m n eq_m_n) (conj_intpartn s) = conj_intpartn (@cast_intpartn m n eq_m_n s).
proof: Proof. by apply val_inj; rewrite /= !cast_intpartnE. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(div ssralg ssrint ssrnum binomial) tools combclass sorted ordtype