Comment #14 on issue 2132 by mattpap: Derivative of RootSum http://code.google.com/p/sympy/issues/detail?id=2132
I used 'auto' keyword because RootSum with auto=False isn't unevaluated, it just skips some of its simplification algorithms (this is different from being unevaluated, like e.g. Mul(..., evaluate=False)).
If it hangs on line 645, then this is performance issue. Implementation of Frac() should help here.
Today I rebased polys11 on top of master, as polys12. Currently I'm polishing the new branch and fixing issues related make_args() and its implementation. I will publish the branch when I'm done with this (hopefully in an hour). I don't plan any new things to be implemented in polys12 (besides maybe 'auto' flag in div() and friends). There are a few test failures in ode module. When polys12 will be ready, can you look into this? I didn't run the full tests suit yet, but in polys11 those were the only tests failures (3 tests + 3 doctests). I also started work on release0.7.0 branch in which I'm fixing issues unrelated to polynomials, but scheduled for this release.
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