` e` is a constant on the TI-83 series calculators. The constant holds the approximate value of Euler's number, fairly important in calculus and other higher-level mathematics.

The approximate value, to as many digits as stored in the calculator, is 2.718281828459…

The main use of ` e` is as the base of the exponential function

`e^(`(which is also a separate function on the calculator), and its inverse, the natural logarithm

`ln(`. From these functions, others such as the trigonometric functions (e.g.

`sin(`) and the hyperbolic functions (e.g.

`sinh(`) can be defined. In

`re^θi`mode,

`is used in an alternate form of expressing complex numbers.`

*e*Important as the number ` e` is, nine times out of ten you won't need the constant itself when using your calculator, but rather the

`e^(`and

`ln(`functions.

# Related Commands

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