proposition: Lemma homsym_is_linear : linear (@homsym n R d : {homsym R[n, d]} -> {sympoly R[n]}).
proof: Proof. by []. 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