Parseval's Integral
The Poisson integral with n=0,
where J_0(z) is a Bessel function of the first kind.
See also
Bessel Function of the First Kind, Poisson IntegralExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Parseval's Integral." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ParsevalsIntegral.html