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4.10.3 Commands and Functions for Rational Functions
The following are commands and functions for rational functions:
BringIn bring in objects from another ring
Den denominator
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 numerator
Product the product of the elements of a list
Size the amount of memory used by an object
Subst substitute values for indeterminates
Sum the sum of the elements of a list

For details look up each item by name. Online, try ?ItemName or H.Syntax("ItemName").