The exponent applied to the base number of 2.718 to equal a given value. For example, 2 is the natural logarithm that is equal to a value of 7.389. (2.718)2 = 7.389

Same as "Hyperbolic Logarithm." -- A system of logarithms in which the base is 2.71828

Logarithm to the base (approximately 2.7183).

The natural logarithm, formerly known as the hyperbolic logarithm, is the logarithm to the base e, where e is a certain constant approximately equal to 2.718281828459. The natural logarithm can be defined for all positive real numbers x as the area under the curve y = 1/t from 1 to x, and can also be defined for non-zero complex numbers as will be explained below.