fact: Definition LRtab_coeff (P : 'P_(d1 + d2)) := #|LRtab_set P|.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg) mathcomp(ssrcomplements freeg mpoly) tools ordtype partition Yamanouchi std tableau stdtab Schensted congr plactic stdplact Yam_plact Greene_inv shuffle Schur_mpoly