Issue 414: series bug: leadterm is wrong
http://code.google.com/p/sympy/issues/detail?id=414
Comment #2 by ondrej.certik:
In [1]: var("a")
Out[1]: a
In [2]: e=1/((a + x)**3 - a**3)*(a + (a + x)**2 - (1 + a)*(a + x))
In [3]:
In [4]: e.series(x, 4)
Out[4]:
2 2 3 3 4 4 5
6
1 x 1 2⋅x x x x 2⋅x x x 28⋅x
─── + ──── - ──── - ──── - ──── + ──── + ──── - ───── - ───── + ───── -
─────
3⋅a 3 2 4 3 5 4 5 6 6
7
3⋅a 3⋅a 9⋅a 9⋅a 9⋅a 9⋅a 27⋅a 27⋅a 27⋅a 81⋅a
6
28⋅x
+ ───── + O(x**7)
8
81⋅a
In [5]: e.series(x, 4).leadterm(x)
Out[5]:
⎛ 1 1 ⎞
⎜─── - ────, 0⎟
⎜3⋅a 2 ⎟
⎝ 3⋅a ⎠
The test is effectively this limit:
http://git.sympy.org/?p=sympy.git;a=commitdiff;h=e2b3b416bb126fe81ab4f2acef861b982a5ef78e
Issue attribute updates:
Status: Fixed
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