Updates:
Status: Fixed
Comment #6 on issue 3461 by skirpic...@gmail.com: Incorrect Limit
http://code.google.com/p/sympy/issues/detail?id=3461
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Comment #5 on issue 3461 by skirpic...@gmail.com: Incorrect Limit
http://code.google.com/p/sympy/issues/detail?id=3461
https://github.com/sympy/sympy/pull/2000
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Labels: Type-Defect Priority-Medium
New issue 3461 by fred...@witherden.org: Incorrect Limit
http://code.google.com/p/sympy/issues/detail?id=3461
Consider:
In[5]: expr = S('5*x**3/4 - 3*x/4 + (_eta_k*(3*x**2/2 - 1/2) + 35*x**4/8 -
15*x**2/4 + 3/8)/(2*(_eta_k + 1))')
Updates:
Status: Valid
Labels: Series WrongResult
Comment #1 on issue 3461 by asmeu...@gmail.com: Incorrect Limit
http://code.google.com/p/sympy/issues/detail?id=3461
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Labels: l
Comment #2 on issue 3461 by someb...@bluewin.ch: Incorrect Limit
http://code.google.com/p/sympy/issues/detail?id=3461
Note that we can easily get the correct value by first expanding the
expression:
In [15]: expand(expr)
Out[15]: 3*_eta_k*x**2/(4*(_eta_k + 1)) -
Updates:
Labels: -l
Comment #3 on issue 3461 by asmeu...@gmail.com: Incorrect Limit
http://code.google.com/p/sympy/issues/detail?id=3461
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Comment #4 on issue 3461 by asmeu...@gmail.com: Incorrect Limit
http://code.google.com/p/sympy/issues/detail?id=3461
As usual, gruntz does the right thing, indicating that the problem is with
the limit() heuristics.
In [8]: gruntz(expr, _eta_k, oo)
Out[8]:
3 2
5⋅x3⋅x3⋅x 1
