Josh on Tertulia: "f^(x)=∫−∞∞f^(ξ) e2πiξx dξ\hat{f}(x) = \int_{-\infty}^\infty \hat{f}(\xi)\,e^{2 \pi i \xi x}\,d\xif^(x)=∫−∞∞f^(ξ)e2πiξxdξ " / Tertulia

$\hat{f}(x) = \int_{-\infty}^\infty \hat{f}(\xi)\,e^{2 \pi i \xi x}\,d\xi$