proposition: Lemma homsymprod_hh : 'hh[Plla] = 'hh[rowpartn l0] *h 'hh[Pla] :> HSF.
proof: Proof. by apply val_inj; rewrite /= prod_genM intpartn_cons. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg matrix vector ssrnum algC archimedean) mathcomp(fingroup perm) mathcomp(ssrcomplements freeg mpoly) tools sorted ordtype permuted partition permcent antisym Schur_mpoly Schur_altdef sympoly