Updates: Labels: Integration Comment #4 on issue 2642 by asmeurer: Complicated multiple integral http://code.google.com/p/sympy/issues/detail?id=2642
Since Integral.doit() uses linearity for computing indefinite integrals
This is going to change, because it's a bad idea. Compare integrate(log(x)*x**x + x**x, x) with integrate(x**x*(log(x) + 1), x) using heurisch(). Also, see comment 3 of issue 1961.
But perhaps it would be a good idea to try pulling out stuff that risch_integrate() can't do rather than just failing and passing it on to the next method. There would have to be a disclaimer that a nonelementary integral result only applies to the term itself, not to the whole expression. I apparently haven't given enough thought to the overall strategy that integrate() will use when risch_integrate() is merged, especially now that we have this meijerg method.
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