proposition: Lemma divr_ge0 x y : 0 <= x -> 0 <= y -> 0 <= x / y.
proof: Proof. by move=> x_ge0 y_ge0; rewrite mulr_ge0 ?invr_ge0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)