proposition: Fact map_sympoly_is_multiplicative : multiplicative map_sympoly.
proof: Proof. by split=> [i j|]; apply val_inj; rewrite /= ?rmorphM ?rmorph1. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg ssrint fingroup perm) mathcomp(ssrcomplements freeg mpoly) sorted tools ordtype permuted partition skewpart composition Yamanouchi std tableau stdtab skewtab permcent antisym Schur_mpoly therule Schur_altdef unitriginv