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[tex] \int_{-\infty}^{\infty}dxf(x)exp(iux) [/tex]

and the evaluation of the ivnerse Fourier transform

[tex] \int_{-\infty}^{\infty}du\frac{F(u))}{\int_{-\infty}^{\infty}g(x)exp(iux)dx} [/tex]

the idea is to implement some numerical tool to evaluate Fourier transform integral, in order to apply them to solve Wiener-Hopf equation.