Updates:
Blockedon: 2712
Comment #4 on issue 2908 by [email protected]: simplification of polygamma
needed
http://code.google.com/p/sympy/issues/detail?id=2908
I don't think hyperexpand has anything to do with this. It should only ever
touch hyper() and meijerg() instances in the expression, anything else is a
bug (My guess is that the confusion stems from the following: expand_func()
applied to hyper() and meijerg() instances calls hyperexpand.)
I think simplification of polygamma functions should be incorporated into
combsimp. This shouldn't be too hard and I can look into it. I made
(fairly) substantial changes to combsimp in gsoc-2 and gsoc-3 though, so
I'd prefer to merge these two first.
(I'm blocking this issue on 2712 to remind me to look into this when the
merge is done.)
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