Comment #3 on issue 3070 by smi...@gmail.com: cse raises error with RootOf
http://code.google.com/p/sympy/issues/detail?id=3070
In the preprocessing in cse, the expr, e, of a RootOf is identified as
having an extractable sign. This ends up calling PurePoly(Neg(e)) ->
PurePoly(Neg(e), Neg(e)) in RootOf.__new__. When a check is made on the
order of the PurePoly it comes back as 1 (since it is "linear" in the
generator). But perhaps index for the RootOf instance was 2 so then it
thinks there is an error -- the order of the Neg expression (1) is less
than the requested index (2) so an error is raised. Perhaps one way around
this is not not wrap expressions in Neg but to add Neg to a given expresion?
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