proposition: Lemma qX_in_unit : ('qX : qT) \in GRing.unit.
proof: Proof. by rewrite unitfE /= qX_neq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice fintype tuple) mathcomp(div bigop binomial finset finfun ssralg countalg finalg) mathcomp(poly polydiv qpoly perm fingroup falgebra fieldext finfield galois) mathcomp(finalg zmodp matrix vector)