Updates:
Blockedon: -sympy:2010 sympy:2010
Comment #10 on issue 1054 by [email protected]: Triple integral
1/(1+x+y+z) fails
http://code.google.com/p/sympy/issues/detail?id=1054
And with risch_integrate merged with integrate
(https://github.com/sympy/sympy/pull/1643) it now gives -12*log(3) -
3*log(6)/2 + 47*log(2)/2. The class of (indefinite) integrals of 1/(1 + x1
+ ... + xn) dx1...dxn is a rather interesting class. It's another example
where risch works well and heurisch chokes, not so much because it can't do
it, but because it is unable to see the simple structure at each stage (it
just looks like x + x*log(x) + x**2*log(x) + ... + x**n*log(x), with some
extra constants).
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