proposition: Lemma fgposE D : fgpos D = \sum_(z <- dom D | coeff z D >= 0) << `|coeff z D| *g z >>.
proof: Proof. by []. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order generic_quotient) mathcomp(ssralg ssrnum ssrint)