fact: Definition in_homsym (p : Pol) : HSF := \sum_(la : 'P_d) p@_(mpart la) *: 'hm[la].
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