This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.

# Rational

 Rationalis the head used for rational numbers.
• You can enter a rational number in the form .
• The pattern object can be used to stand for a rational number. It cannot stand for a single integer.
Enter a rational number:
Rational is the Head for rational numbers:
Enter a rational number:
 Out[1]=
Rational is the Head for rational numbers:
 Out[2]=
 Scope   (7)
Enter a rational number with very big integers in the numerator and denominator:
Rational numbers are represented with the smallest possible denominator:
The FullForm of a rational number is Rational:
Enter a rational using the FullForm:
You have to use Numerator and Denominator to extract parts of Rational numbers:
Part does not work:
The pattern object can be used to stand for a rational number:
It cannot stand for a single integer:
A rule that replaces all rationals with their reciprocals:
An alternate way to write the rule:
 Applications   (1)
Define a function that only applies to rational numbers:
This is a close approximation to :
An alternative definition of the function:
Rationals are numbers:
Rationals are atomic objects with no subexpressions:
Rationals are exact numbers:
Use Rationals to indicate assumptions and domain conditions:
Numbers entered in the form only become Rational numbers on evaluation:
The unevaluated form is expressed in terms of Times and Power:
New in 1