Updates:
        Status: Started
        Owner: [email protected]
        Labels: NeedsReview

Comment #4 on issue 3328 by [email protected]: Integrating simple DiracDelta
http://code.google.com/p/sympy/issues/detail?id=3328

This works in https://github.com/sympy/sympy/pull/1620:

In [7]: integrate(integrate(integrate(DiracDelta(x - y - z), (z, 0, oo)), (x, 0, 1)), (y, 0, 1))
Out[7]: 1

I think 1 is the correct answer, not -1. It was added as a test. The order in which one lists the integration variable is crucial for the integration code to finish.

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