Taking the constant number e as the Base logarithms is called Nature logarithms, denote ln^N(N>0).

It means that the unit time, the continuous doubling can reach the limit value.

Nature logarithms Base e is given by one important limit. We Definition: As x approaches infinity, lim(1+1/x)^x=e.

e is one infinite non-cyclic small number, the value of which is about be tantamount to 2.718281828... , it is one beyond number.