Comment #11 on issue 2042 by asmeu...@gmail.com: Frac() object for rational function arithmetics
http://code.google.com/p/sympy/issues/detail?id=2042

Can you write a little guide (in the docs, or even on the wiki): how to replace tuples of Poly with FracElement. I would particularly like to know how to get features like ensuring the denominator is monic, or the proper way to make assertions that are polynomials (as opposed to rational functions) in the given variable. Transforming risch is a bit of work, so I want to make sure it's done right the first time.

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