| rational | System Class |
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.
Abbreviating.
| (rational [lower-limit [upper-limit]]) |
lower-limit, upper-limit — interval designators for type rational. The defaults for each of lower-limit and upper-limit is the symbol *.
This denotes the rationals on the interval described by lower-limit and upper-limit.