where is the base. is called the logarithm of to the base . Furthermore, is called the natural logarithm and is called the common logarithm. However, some books may define as the natural logarithm.
is the base. 
is called the logarithm of 
to the base 
is called the natural logarithm and 
is called the common logarithm. However, some books may define 
as the natural logarithm.
