Updates:
Cc: fredrik.johansson
Labels: Series
Comment #1 on issue 2151 by asmeurer: BasicMeta.keep_sign
http://code.google.com/p/sympy/issues/detail?id=2151
It seems that it is relying on hypersimp((-1)**(1 + n)/(1 + n), n)
returning -(1 + n)/(2 + n) instead of (1 + n)/(-2 - n). I think it will
require someone who knows how this algorithm works to fix it. Maybe it
just needs the denominator to be monic (?)
The problem in particular is in the check_convergence() function in
evalf.py. Anyway, the author appears to be, not surprisingly, Fredrik.
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