Incorrect integral in Mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg91362] Incorrect integral in Mathematica*From*: Eran Mukamel <emukamel at stanford.edu>*Date*: Mon, 18 Aug 2008 03:37:03 -0400 (EDT)

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