proposition: Lemma wH0 : wH 0 = O.
proof: Proof. by rewrite wH_sum big1 // => i _; rewrite mxE eqxx. Qed.
imports: Reals mathcomp(all_ssreflect fingroup zmodp ssralg finalg perm matrix) mathcomp(poly mxalgebra mxpoly) mathcomp(Rstruct) ssr_ext ssralg_ext f2 num_occ natbin ssrR Reals_ext bigop_ext