Comment #3 on issue 2320 by [email protected]: hydrogen doctest failures http://code.google.com/p/sympy/issues/detail?id=2320
Ok, this patch changes laguerre_l to generate polynomials in *unexpanded* form. I think it's a step back, as now you always need to call expand(). Let's figure out the motivation for the patch. So far the solution seems to me to revert this patch, or call expand() in the laguerre_l, which might however be slower than the previous approach.
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