Comment #1 on issue 3880 by [email protected]: Test failure in hyperexpand
http://code.google.com/p/sympy/issues/detail?id=3880
It seems that the following subtest fails:
In [6]: hyper([-S.Half, 1], [2,2], z)
Out[6]: hyper((-1/2, 1), (2, 2), z)
where hyperexpand can not do it:
In [7]: hyperexpand(_)
Out[7]: -2*hyper((-3/2,), (1,), z)/(3*z) + 2/(3*z)
The result would be only Bessel functions:
http://functions.wolfram.com/HypergeometricFunctions/Hypergeometric2F2/03/03/06/03/10/0001/
It is not clear why we can not handle those right now. (Many other Bessels
work.)
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