proposition: Lemma ltr0_ge_norm : {in neg &, {mono (@normr _ R) : x y / x <= y >-> x >= y}}.
proof: Proof. by move=> x y; rewrite !negrE => /ltW x0 /ltW y0; exact: ler0_ge_norm. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)