proposition: Lemma deg2_poly_gt0r x : r2 < x -> 0 < p.[x].
proof: Proof. by move=> ?; apply: deg2_poly_gt0r; rewrite // -/a ?a1 ?ler01 ?mulr1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)