Convolution theorem
= Convolution theorem
{wiki}
For $\widehat f(\xi)=\int f(x)e^{-2\pi ix\cdot\xi}\,dx$, Fubini gives $\widehat{f*g}=\widehat f\,\widehat g$.
= Convolution theorem
{wiki}
For $\widehat f(\xi)=\int f(x)e^{-2\pi ix\cdot\xi}\,dx$, Fubini gives $\widehat{f*g}=\widehat f\,\widehat g$.