 reserve n,i,k,m for Nat;
 reserve p for Prime;

theorem
  Harmonic 2 = 3 / 2
  proof
    Harmonic (1 + 1) = Harmonic 1 + 1 / (1 + 1) by Harmon1
       .= 3 / 2 by Harm1;
    hence thesis;
  end;
