theorem Th1:
  z|^11 = z*z*z*z*z*z*z*z*z*z*z
  proof
A1: 11 = 10+1;
    z|^10 = z*z*z*z*z*z*z*z*z*z by NUMBER02:6;
    hence thesis by A1,NEWTON:6;
  end;
