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    Real Analysis : Fourier Transform for L1R

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    Proof regarding a Fourier Transform for L1R.

    Show 1/2pi ∫-1 -->1 (1 -|y|)e^(iyx) dy = 1/2pi [(sin x/2)/(x/2)]^2

    Please see the attached file.

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    Text: An Introduction to Harmoni c Analysis (Fourier Series)
    by Yitzhak Katznelson

    The following problem is a portion of the proof about Fourier Transforms for .

    Problem 1.8: Show

    The first fact we need is that ei = cos  + i sin 

    (If you aren't familiar with this, check out any complex analysis introductory text - I recommend Schaum's, but whatever you or your library may have.)

    Second, dealing with absolute ...

    Solution Summary

    An equality is proven using Fourier transforms.