proposition: Lemma real_ler_norm x : x \is real -> x <= `|x|.
proof: Proof. by case/real_ge0P=> hx //; rewrite (le_trans (ltW hx)) // oppr_ge0 ltW. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)