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3.10.3. Commands and Functions for Rational Functions
The following are commands and functions for rational functions:

  * BringIn -- bring in objects from another ring
  * Der -- the derivative of a rational function
  * Fraction -- returns the quotient of its arguments
  * Inverse -- multiplicative inverse
  * IsZero -- test whether an object is zero
  * Len -- the length of an object
  * Num, Den -- numerator, denominator
  * Product, Sum -- the product or sum of the elements of a list
  * Size -- the amount of memory used by an object
  * Subst -- substitute values for indeterminates

Details can be found by looking up each item by name.  Online, try
'?ItemName' or 'H.Syntax("ItemName")'.