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| ANSI Common Lisp 12 Numbers 12.2 Dictionary of Numbers
12.2.28 1+, 1- | Function
  Syntax: 1+ number successor 1- number predecessor Arguments and Values: number - a number. successor, predecessor - a number. Description: 1+ returns a number that is one more than its argument number. 1- returns a number that is one less than its argument number. Examples:
       (1+ 99)  100
       (1- 100)  99
       (1+ (complex 0.0))  #C(1.0 0.0)
       (1- 5/3)  2/3
  Exceptional Situations: Might signal type-error if its argument is not a number. Might signal arithmetic-error. See Also: incf, decf Notes:
       (1+ number) ==(+ number 1)
       (1- number) ==(- number 1)
Implementors are encouraged to make the performance of both the previous expressions be the same. Allegro CL Implementation Details: None.

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