proposition: Lemma sumn_diff_shape_intpartE : sumn (P / P1) = sumn P2.
proof: Proof. Proof using Hincl. by rewrite (sumn_diff_shape Hincl) !sumn_intpartn addKn. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg) mathcomp(mpoly) tools ordcast combclass partition skewpart Yamanouchi ordtype std tableau stdtab Schensted congr plactic Greene_inv stdplact Yam_plact skewtab shuffle Schur_mpoly freeSchur