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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?:


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
Integrate[-------------, {w, -Pi, Pi}]
                   -I w
          1 - 0.5 E
                 2 Pi

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

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