Translations:Dictionary:Causality/24/en

$\int _{-\infty }^{\infty }f(t)H(t)e^{i\omega t}\;dt={\frac {1}{2\pi }}(F\star {\hat {H}})(\omega )={\frac {1}{2\pi }}\int _{-\infty }^{\infty }{\hat {H}}(\omega -\Omega )F(\Omega )\;d\Omega .$