fact: Definition eqeval n (t : (seq (seq 'I_n.+1))) (la : seq nat) := eval (to_word t) == mpart la.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg ssrint fingroup perm) mathcomp(mpoly) tools combclass ordtype sorted partition tableau skewpart skewtab antisym Schur_mpoly freeSchur therule std stdtab unitriginv presentSn