Updates:
Labels: Series WrongResult
Comment #2 on issue 2555 by asmeurer: Wrong result from residue
http://code.google.com/p/sympy/issues/detail?id=2555
Well, the residue() code basically does this:
exp(1/z).series(z, 0, 0)
exp(1/z)
exp(1/z).series(z, 0, 6)
exp(1/z)
It could at least recognize that the series failed.
Also, I don't know why it doesn't try to do something like:
exp(1/z).subs(z, 1/z).series(z, 0, 6).removeO().subs(z, 1/z)
1 + 1/z + 1/(2*z**2) + 1/(6*z**3) + 1/(24*z**4) + 1/(120*z**5)
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