
theorem Th22:
  for n being non zero Element of NAT holds 1_F_Complex in n -roots_of_1
proof
  let n be non zero Element of NAT;
  1_F_Complex = (power F_Complex).(1_F_Complex,n) by Th8;
  then 1_F_Complex is CRoot of n,1_F_Complex by COMPLFLD:def 2;
  hence thesis;
end;
