public static double exp (double a)

Returns Euler's number *e* raised to the power of a
` double`

value. Special cases:

- If the argument is NaN, the result is NaN.
- If the argument is positive infinity, then the result is positive infinity.
- If the argument is negative infinity, then the result is positive zero.

`a` | the exponent to raise e to. |

*e*^{ a},
where *e* is the base of the natural logarithms.

Diagram: Math