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Integration failure


NeXT Computer OS 2.1
Mathematica V2.1

Dear MathGroup, 

Does anybody know why the integration routines are failing here?:

(*input:*)
Needs["Calculus`DiracDelta`"]

X[z_] := 1/(1 - 0.5 z^-1)
 

Integrate[X[E^(I w)] E^(I w n), {w, -Pi, Pi}] / (2 Pi)

 


(*Mathematica output:*)
              I n w
             E
Integrate[-------------, {w, -Pi, Pi}]
                   -I w
          1 - 0.5 E
--------------------------------------
                 2 Pi

Please reply explicitly to: jond at ensoniq.com
Jon Dattorro, Ensoniq Corp.






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