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

theorem Diesel2:
  for n being Nat st n > 0 holds
    ln.((n + 1) / n) < 1 / n
  proof
    let n be Nat;
    assume
A1: n > 0;
    (n + 1) / n = n / n + 1 / n by XCMPLX_1:62
      .= 1 + 1 / n by A1,XCMPLX_1:60;
    hence thesis by Diesel1,A1;
  end;
