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Incorrect integral in Mathematica


Hi All,

I'm getting a nonsensical answer of 0 for the following integral in Mathematica 5.0 (Mac OSX):

Integrate[Exp[-x^2/(2w^2)]Exp[-(y - y0)^2/(2z^2)],
  {x, -Infinity, Infinity}, {y, -Infinity, Infinity}]

The result should be (2 Pi w z).  Any ideas why this fails?

Thanks in advance, Eran


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