reserve i,j for Nat;
reserve A,B for Ring;
reserve K, L for Field;

theorem Lm52: :::?????
  for x be Element of F_Complex holds
  In(1.F_Complex, FQ(x)) = 1.F_Complex
  proof
    let x be Element of F_Complex;
    1.F_Complex = 1.F_Rat by C0SP1:def 3,Th3;
    hence thesis by Lm48,SUBSET_1:def 8;
  end;
