proposition: Lemma pihomogX m : pihomog 'X_[m] = if mf m == d then 'X_[m] else 0.
proof: Proof. by rewrite pihomogE msuppX big_mkcond /= big_seq1 mcoeffX eqxx scale1r. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype tuple finfun bigop finset binomial) mathcomp(order fingroup perm ssralg zmodp poly ssrint) mathcomp(matrix vector) mathcomp(bigenough) ssrcomplements freeg