Logarithms and exponentials

Exponential and logarithmic functions are essential in calculus. The logarithm is used for physical measures, such as the units pH in chemistry and dB in acoustic physics.

Logarithms and exponential
	Number e This is the basis of the Napierian logarithm. e≈2.7183
	Logarithm with base
	Exponential, e powered to the given number.
	Natural or Napierian logarithm
	Logarithm

You must enter e with the button. You can't simply type e with the keyboard because then it's just a variable called e but not the number. The logarithm base can be set as a subindex of the function log(). If no base is set, just log() means the decimal logarithm or, in other words, the base 10 logarithm. Also, ln() means the natural logarithm, which is the base e logarithm.

You can use the Simplify action to force non-trivial simplifications over logarithmic and exponential expressions. Also, the Verify action can test for identities.