proposition: Lemma Re_invc (z : C) : Re z^-1 = Re z / ((Re z) ^+ 2 + (Im z) ^+2).
proof: Proof. by case: z. Qed.
imports: mathcomp(all_ssreflect) mathcomp(ssralg poly polydiv polyorder ssrnum zmodp) mathcomp(polyrcf qe_rcf_th complex) poly_normal pol mathcomp(complex)