Comment #8 on issue 3716 by mrock...@gmail.com: Integrals over non-interval sets
http://code.google.com/p/sympy/issues/detail?id=3716

I think when using integrate(integrand, (symbol, interval)) you're assuming the positive case. This case can be clearly selected by using (symbol, interval.inf, interval.sup).

In the case of Interval(5, 3) this returns an emptyset. This could be added to the list of supported types along with Interval, FiniteSet, Union. Maybe sets gain an integrate(self, symbol, integrand) method?

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