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Allegro CL
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  ANSI Common Lisp   12 Numbers   12.2 Dictionary of Numbers

12.2.6 rational System Class

Class Precedence List:
rational, real, number, t

The canonical representation of a rational is as an integer if its value is integral, and otherwise as a ratio.

The types integer and ratio are disjoint subtypes of type rational.

Compound Type Specifier Kind:

Compound Type Specifier Syntax:
(rational [lower-limit [upper-limit)]]

Compound Type Specifier Arguments:
lower-limit, upper-limit - interval designators for type rational. The defaults for each of lower-limit and upper-limit is the symbol *.

Compound Type Specifier Description:
This denotes the rationals on the interval described by lower-limit and upper-limit.

Allegro CL Implementation Details:

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