reserve z,z1,z2,z3,z4 for Element of F_Complex;

theorem
  z2 <> 0.F_Complex implies |.z1.| / |.z2.| = |.z1 / z2.|
proof
  reconsider z19=z1,z29=z2 as Element of COMPLEX by Def1;
  assume z2 <> 0.F_Complex;
  then z19 / z29 = z1 / z2 by Th6;
  hence thesis by COMPLEX1:67;
end;
