proposition: Lemma YmonK : cancel Ymon monsY.
proof: Proof. move=> ms; apply eq_from_tnth => i. by rewrite tnth_mktuple; apply mnmP => j; rewrite !mnmE mxvec_indexK. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssrint rat ssralg ssrnum algC matrix vector) mathcomp(mpoly) tools partition ordtype antisym Schur_mpoly Schur_altdef sympoly homogsym permcent