theorem Th33:
  for p being Point of TOP-REAL 2 holds |.p`1.|<=|.p.| & |.p`2.| <=|.p.|
proof
  let p be Point of TOP-REAL 2;
  |.p.| = sqrt((p`1)^2+(p`2)^2) by Th30;
  hence thesis by COMPLEX1:79;
end;
