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")'.
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