Comment #3 on issue 1388 by [email protected]: integrate(exp(-x)*x**n,
x) fails
http://code.google.com/p/sympy/issues/detail?id=1388
In [4]: integrate(x**y*exp(-x), x, meijerg=True)
Out[4]:
╭─╮1, 1 ⎛ 1 │ ⎞
│╶┐ ⎜ │ x⎟
╰─╯1, 2 ⎝y + 1 0 │ ⎠
In [5]: hyperexpand(_, allow_hyper=True)
Out[5]:
y + 1 ┌─ ⎛y + 1 │ ⅈ⋅π⎞
x ⋅Γ(y + 1)⋅ ├─ ⎜ │ x⋅ℯ ⎟
1╵ 1 ⎝y + 2 │ ⎠
─────────────────────────────────────
Γ(y + 2)
[Using `n` in place of `y` hangs hyperexpand … I'll fix this.]
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