proposition: Lemma homsymprodDl p q1 q2 : (q1 + q2) *h p = q1 *h p + q2 *h p.
proof: Proof. by rewrite -!homsymprodrE linearD. 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