proposition: Lemma fgpos_le0 D : 0 <=g fgpos D.
proof: Proof. by apply/fgleP=> z; rewrite coeff0 fgmap_f0_coeffE ?normr0 // mulrn_wge0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order generic_quotient) mathcomp(ssralg ssrnum ssrint)