Simplified Common Lisp reference
Symbol class: Mathematics, Arithmetics, Logic and Comparisons
Symbol type: function
expnumber => number
Argument description:
number number to be raised

EXP function returns e raised to the power number, where e is the base of the natural logarithms.

(exp 1) => 2.7182817
(exp 1.0) => 2.7182817
(exp 1.0d0) => 2.718281828459045d0
(exp 10) => 22026.465
(log (exp 10)) => 10.0
Function indexFull documentation for exp (HyperSpec)