Comment #6 on issue 2010 by mattpap: Integration with the full Risch
Algorithm
http://code.google.com/p/sympy/issues/detail?id=2010
This is a deeper problem, because in polys11 I get:
In [1]: var('a,b')
Out[1]: (a, b)
In [2]: integrate(1/((a-x)*(b-x)), x)
Out[2]: 0
which isn't a very convincing result. The reason is the same: odd behavior
concerning rational function domains. Currently domains in polys are both
the strongest and the weakest part of the module (prospective usability and
speed vs. weak current implementation and lack of tests).
As to is_zero, this might be a separate issue, because I had problems with
this property previously (there is an issue where is_zero hangs on a very
simple polynomial).
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