Comment #4 on issue 1388 by asmeurer: integrate(exp(-x)*x**n, x) fails
http://code.google.com/p/sympy/issues/detail?id=1388
Cool. Maybe you could add WhittakerM to your list of special functions to
add some day (this isn't high priority, though).
[Using `n` in place of `y` hangs hyperexpand … I'll fix this.]
That's no good. You should always use Dummys in internal algorithms. If
you want to test the output of internal functions, do something like
def func(args, n=None):
n = n or Dummy('n')
or
def func(args, n=Dummy('n')):
And then, in your tests, pass in Symbol('n'), but otherwise, just let it
use the Dummy (this also lets you pass the Dummy around if you need it to
be equal everywhere).
Also, any reason why hyperexpand isn't called on the result automatically?
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