proposition: Lemma dH0x x : dH 0 x = wH x.
proof: Proof. by rewrite /dH add0r wH_opp. 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