proposition: Lemma sqrMi x: (i * x) ^+ 2 = - x ^+ 2.
proof: Proof. by rewrite exprMn sqrtK mulN1r. 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)