proposition: Lemma coeff_is_additive x : additive (coeff x).
proof: Proof. exact: lift_is_additive R^o _. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order generic_quotient) mathcomp(ssralg ssrnum ssrint)