such that eqn.(6) simplifies to: T p    =    T 1 /p [ 1  + 1/2    + 1/3    + ...   + 1/p ]  (7) The terms in the square brackets are a harmonic series which, up to a constant, is equal to the natural logarithm of p. Log(p)   ≈    1  + 1/2    + 1/3    + ...   + 1/p  (8) Hence, we can write