MathGroup Archive 2001

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Re: Multiple choice question

  • To: mathgroup at
  • Subject: [mg26983] Re: Multiple choice question
  • From: "A. Ciarkowski" <aciark at>
  • Date: Tue, 30 Jan 2001 23:22:09 -0500 (EST)
  • Sender: owner-wri-mathgroup at

I have just learnt from prof. J. Boersma how to
properly perform analytic continuation of an
integral understood in the sense of its principal
value onto a complex plane with a cut. In view of 
his remarks, I must correct myself: the integral

Integrate[ Exp[ I t 2 ]/(t - 1 - I), {t, 0, Infinity}] 


Exp[2 I - 2] ( Pi I - ExpIntegralEi[ 2 - 2 I] ),

and hence the first result, Out[12], is correct.


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