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Integrate problem


  evaluating the integral

Integrate[Sin[1/x]*(Exp[(-a)*x^2]/x), {x, 0, Infinity}, Assumptions -> a > 0]

in Mathematica 6.0.1 produces
(1/2)*Pi*HypergeometricPFQ[{}, {1/2, 1}, a/4] - 
Sqrt[a]*Sqrt[Pi]*HypergeometricPFQ[{}, {3/2, 3/2}, a/4]

What is the meaning of the empty list in the first parameter of  HypergeometricPFQ?

Thanks for answers,

Michael Weyrauch

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