proposition: Lemma homsymprod_suml p I r (P : pred I) (q : I -> {homsym R[n, c]}) : (\sum_(i <- r | P i) q i) *h p = \sum_(i <- r | P i) q i *h p.
proof: Proof. by rewrite -!homsymprodrE linear_sum. 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