Status: Started
Owner: [email protected]
CC: [email protected]
Labels: Type-Defect Priority-Medium Integration
New issue 3886 by [email protected]: Incorrect Piecewise result from
risch_integrate
http://code.google.com/p/sympy/issues/detail?id=3886
In [8]: integrate(x*exp(-k*x),x)
Out[8]:
⎧ 3
⎪ x for k = 0
⎪
⎪⎛ 2 ⎞ -k⋅x
⎨⎝- k ⋅x - k⎠⋅ℯ
⎪────────────────── otherwise
⎪ 3
⎪ k
⎩
But we would expect k**3 = 0 case to correspond to x**2/2.
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