The natural logarithm of a number is its logarithm to the base
, where
is an irrational and transcendental constant.
The base of the natural logarithm function is by definition
.

The value of
is approximately equal to
.
Definition of
:
The letter
denotes the positive real numbers such that,
.
The natural logarithm of a number is its logarithm to the base
, where
is an irrational and transcendental constant.