Updates:
        Labels: Integration

Comment #6 on issue 1054 by asmeurer: Triple integral 1/(1+x+y+z) fails
http://code.google.com/p/sympy/issues/detail?id=1054

This returns the correct result in master, as confirmed by Maple:

In [2]: print integrate(1/(1+x+y+z), (x, 0, 1), (y, 0, 1), (z, 0, 1))
6*log(2) + 8*log(4) - 27*log(3)/2

It gives 6*log(2) + 8*log(4) instead of 22*log(2) as Maple does because of issue 1827.

What remains is to add a test, which I have done in my integration3 branch.

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