proposition: Lemma normM x y : norm (x * y) = norm x * norm y.
proof: Proof. by rewrite mulrACA -rmorphM; apply: normE; rewrite exprMn !sqrtK. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun ssrnat eqtype seq choice) mathcomp(div fintype path bigop finset prime order ssralg) mathcomp(poly polydiv mxpoly generic_quotient countalg) mathcomp(ssrnum closed_field ssrint archimedean rat intdiv) mathcomp(algebraics_fundamentals)