proposition: Lemma real_normK x : x \is real -> `|x| ^+ 2 = x ^+ 2.
proof: Proof. by move=> Rx; rewrite -normrX ger0_norm -?realEsqr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)