proposition: Fact dhomog_of_sym_is_linear : linear dhomog_of_homogsym.
proof: Proof. by move=> r p q; apply val_inj. 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