Natural Logarithm key:
This key while pressed will compute the natural logarithm (base e) of the number x in the show, where x is greater than zero.
This key when pressed before the log and ln keys will compute the anti- log of the number x in the display. While used with the log key it will raise 10 to the displayed power (107.12) and while used with the ln key will raise (e) to the displayed power (e-381).