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

theorem Harmon1:
  Harmonic (n + 1) = Harmonic n + 1 / (n + 1)
  proof
    (Partial_Sums invNAT).(n + 1)
      = (Partial_Sums invNAT).n + invNAT.(n + 1) by SERIES_1:def 1
     .= Harmonic n + 1 / (n + 1) by MOEBIUS2:def 2;
    hence thesis;
  end;
