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| ANSI Common Lisp 5 Data and Control Flow 5.3 Dictionary of Data and Control Flow
5.3.31 not | Function
  Syntax: not x boolean Arguments and Values: x - a generalized boolean (i.e., any object). boolean - a boolean. Description: Returns t if x is false; otherwise, returns nil. Examples:
       (not nil)   T
       (not '())   T
       (not (integerp 'sss))   T
       (not (integerp 1))   NIL
       (not 3.7)   NIL
       (not 'apple)   NIL
See Also: null Notes: not is intended to be used to invert the `truth value' of a boolean (or generalized boolean) whereas null is intended to be used to test for the empty list. Operationally, not and null compute the same result; which to use is a matter of style. Allegro CL Implementation Details: None.

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