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Convexity and the Riemann \(\xi\)-function.

The Riemann hypothesis is known to be equivalent to the statement that all the zeros of the Fourier transform \(H(x)=\int _ 0 ^ {\infty} \Phi (t)\cos (xt)\,dt\) with \[ \Phi (t)=\sum _ {n=1} ^ {\infty} \pi n^2(2\pi n^2e^ {4t}-3)\exp (5t-\pi n^2e^ {4t}) \] are real. Therefore it is of interest to study the kernel \(\Phi (t)\).
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