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Poisson Formula and Orthonormality

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4. "Poisson Formula and Orthonormality".
Let .... be the Fourier transform of (x)
.....
With the Poisson formula one can show that the family of functions ......
is orthonormal if and only if
..... = const.
PROVE or DISPROVE this claim. If the claim is true, what would be the value of "const."?

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Solution Summary

Orthonormality of a Fourier transform is proven using the Poisson formula. The slution is detailed and well presented.

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Please see the attachment.

Proof:
Assume , , . Let

Then we can ...

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