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rainbowings

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**discrete Fourier tranforms -help!**

How does one write the orthogonality condition for discrete Fourier tranforms - alternatley, how does one express the kronecker delta as a sum over exp(i k x) kind of thing. One last thing - what is the mormalization constant in front of the sum (analogous to the 1/2 pi for the Fourier resolution of the dirac delta function)?