proposition: Lemma mdeg1P m : reflect (exists i, m == U_(i)%MM) (mdeg m == 1%N).
proof: Proof. by rewrite mdeg_eq1; apply/existsP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype tuple finfun bigop finset binomial) mathcomp(order fingroup perm ssralg zmodp poly ssrint) mathcomp(matrix vector) mathcomp(bigenough) ssrcomplements freeg